X不能=2

n=5

E是选项解释是不是有点问题？应该是， “如果是这样“ 是不是应该改为 ”取非后“ ？

A中：they are for diesel-powered vehicles中的代词是实物指代的，它必须指代前面出现过的名词，即，standards。显然地，对于柴油汽车和运动汽车，它们的标准是不同的，运动汽车的标准不可能给柴油汽车用，代词they应该改成those，表示一个新的指代物。
解释超棒！

转自 https://gmatclub.com/forum/until-recently-the-inuit-people-led-a-nomadic-existence-80582.html
【D】 The "up" is unnecessary. The present perfect tense starts in the past and continues into the present. But the use of "until recently" implies that this has stopped, so the present perfect doesn't work.
until recently 直到最近，不久前；应当用过去时态。

以前忽略了这个诶.....老师厉害

A中的like是否也不能用来表示举例？

Felt Nubi, I gave my Xigai

as well as 后面不能跟 verb

E选项的错误在于her无指代，对吗？

又又又又错了.....是错出惯性了诶.....
B. at a cost raising water bills so high that
This option changes the intended meaning very subtly. So does option C. They implies that the proposal's cost raised the water bills rather than the projects'.

like是一个介词，身后不能连接句子（some have asserted），只能连接名词或名词短语。

麻烦老师指导下B和C，感觉真的很像啊，很难排除一个选另一个

【转自 https://www.manhattanprep.com/gmat/forums/sc-the-en-t9524.html】希望有所帮助。
Ron 大神：COMMA + -ING modifiers modify the ENTIRE PRECEDING CLAUSE (including the subject of that clause).
A/C 选项，say是oil industry 的动作，所以用which says而不用saying。

我以为with xxx只可以修饰就近noun？

B选项：本选项中的定语从句的appeared应该从过去时改成现在完成时have appeared，这是因为，消失的动物，应该是“到现在为止”出现在地球上的，不是过去出现在地球上的。

participants和全部的病人，样本代表性问题。

A为什么错了啊，没感觉出来A表现出了从属关系

A：you can't use a "comma + __ing" modifier, because the resulting meaning is nonsense.
remember, that type of modifier must meaningfully modify (= describe, explain, clarify, etc.) the action in the preceding part.
here, though, the preceding part is about the appearance of species, so, clearly, the "vanishing" part cannot modify it.

果因推理，B选项是说明结果问题。类型是A, however not B。B是喝酒减少。
文段因：喝酒减少，果：车祸减少。
B选项给出另一事件：外出饮酒量降低。外出饮酒量降低，导致车祸减少。