was dated at 34 million years old主谓一致错误同(B)；主语fossils和谓语动词made之间不应添加逗号，例如：
(1) I play cards.
(2)** I, play cards.
句(2)是错误的，不能用逗号隔开主语和谓语动词。（有时因有插入语导致谓语动词身前有逗号，这不矛盾。因为那个逗号是用来隔开插入语和主句的，不是用来隔开主语和谓语动词的。语法上不允许有目的是为了隔开主语和谓语动词的逗号）
C: This choice again represents an illogical comparison. The omitted part here is “it costs for running”. Now, since “running” is not already used in the sentence, it can’t be omitted. Note that, in ellipsis the omitted words need to be present somewhere else in the sentence.
expect的约束力较强，身后的宾语或宾补应该用不定式的形式。
d也有歧义，可以是 increase of piracy would become more widely available，也可以是 high-speed Internet connections would become more widely available
It is true that the relative pronoun modifier “who” is used for the doer of an action, and “whom” is used for the receiver of an action. However, the correct answer choice of the said official question does not only use “whom”. It uses the phrases “many of whom”.
In fact, the word “many” in the phrase “many of whom” is the doer of the action. The word “whom” has been used to refer to “4 million people”.
A：It appears, somewhat implausibly, to say that the ancient Greek materials were similar to the earlier ancient Egyptian ones in that both were used by Roman, Muslim, and modern builders.
【Rivaling the pyramids of Egypt or even the ancient cities of the Maya as an achievement, 】the army of terra-cotta warriors 【created to protect Qin Shi Huang, China's first emperor, in his afterlife 】《is more than 2,000 years old 》and《 took 700,000 artisans more than 36 years to complete》 .
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①speculation和possible有重复的可能性②总感觉possibly another increase很诡异 觉得用possible就完全可以
③they的指代非常不清楚 完全不如C直接清楚