supposedly修饰Mediterranean，即之前已确定是祖先，但不确定祖先是不是地中海的石头（推测）；supposed修饰predecessors，即不确定是不是祖先。根据本句逻辑，大概表达的意思是，本来人们推测这些地中海的石头是megalithic monuments in Brittany的祖先，但是现在的碳14检测发现megalithic monuments in Brittany比地中海的石头还早两千年，因此原来推测出的“祖先”是错误的，因此选supposed更合适

https://www.manhattanprep.com/gmat/forums/confusion-regarding-placement-of-an-adverb-og-question-t1333.html

不會有人說 我跟你2000歲一樣大 要就會說 我比你大2000歲
有確定數字ㄌ

than any of their supposed XXX 指比这些他们推测为祖先的还老； supposedly XX adv也没地方修饰

1.key takeaway
X is 200 times as old as Y -- CORRECT.
X is 200 years as old as Y -- WRONG.
X is 200 years older than Y--CORRECT
2.supposed修饰predecessors，表示推测可能是predecessors，
supposedly是副词不修饰predecessors，而是修饰Mediterranean，地中海地区的。

As with many complicated SC problems, the first thing you have to figure out is WHAT THE SENTENCE IS TRYING TO SAY. In many cases this is straightforward, but not here. The process:
(1) "2000 years as old as" is nonsense. If you don't see why, try applying it to a statement about other ages: "I am about 4 years as old as my brother." Huh?
This is good enough to eliminate all of A, C, E.
The only reasonable interpretation is that the monuments in Brittany are 2000 years OLDER than the other ones. There's no other way in which this sentence could legitimately make sense.
(2) To break the deadlock between B and D, we need to use the MEANING of the sentence. Here's the meaning of each choice.
Choice B ('supposed Mediterranean predecessors') --> There's no doubt that the other monuments are Mediterranean, but what was supposed (and now disproved by the new evidence) is that they were the predecessors of the ones in Brittany.
Choice D ('supposedly Mediterranean predecessors') --> There's no doubt that the other monuments are the predecessors of the ones in Brittany, but what was supposed (and now disproved by the new evidence) is that they were Mediterranean.
B makes sense; D doesn't. If you don't immediately see why, consider that the decisive evidence was carbon-14 dating (which is used to tell how old things are, not where they're from).

We can't say that something is nearly 2000 yrs as old as ; rather 2000 yrs older is more correct form.

这题和manhattan那个例句不一样，例句supposed修饰ancestor逻辑不符合，但这里就是要修饰ancestor，表示不确定是不是ancestor，而不是确定了ancestor不确定是不是地中海的

1.key takeaway
X is 200 times as old as Y -- CORRECT.
X is 200 years as old as Y -- WRONG.
X is 200 years older than Y--CORRECT
2.supposed修饰predecessors，表示推测可能是predecessors，
supposedly是副词不修饰predecessors，而是修饰Mediterranean，地中海地区的。

2000years more than 才对

地中海是确定的，那些石碑就在地中海边上，没法假想。只能假想前辈们。

A is 100 times as old as B. 正确
A is 100 years older than B. 正确
A is 100 years as old as B. 错误

A is 100 times as old as B. 正确
A is 100 years older than B. 正确
A is 100 years as old as B. 错误

1.key takeaway
X is 200 times as old as Y -- CORRECT.
X is 200 years as old as Y -- WRONG.
X is 200 years older than Y--CORRECT
2.supposed修饰predecessors，表示推测可能是predecessors，
supposedly是副词不修饰predecessors，而是修饰Mediterranean，地中海地区的。

sc
A is 100 times as old as B. 正确
A is 100 years older than B. 正确
A is 100 years as old as B. 错误

A is 100 times as old as B. 正确
A is 100 years older than B. 正确
A is 100 years as old as B. 错误

楼下key takeaway
A is 100 times as old as B. 正确
A is 100 years older than B. 正确
A is 100 years as old as B. 错误

A: X is as old as B 是错的， x is 100 times as old as B 正确
B:
C: 同上
D:同下
E:supposedly 修饰错误

XXX

楼下小姐姐正解
key takeaway
A is 100 times as old as B. 正确
A is 100 years older than B. 正确
A is 100 years as old as B. 错误