The answer has to be D. First we eliminate A,B,and E because of the impropriety use of being. Then we come down to C and D. Between C and D, D is preferable for that "it" in C technically refers back to the word "the species" and therefore it makes no sense by saying "the species is so genetically similar". Besides it is unidiomatic to say "something is similar". It's better if it says A is similar to B. Third, in the preposition phrase "the kind of struggles", "struggles" should be the word to determine the verb form of "limit" or "limits"(the same rule applies to "type", "kind", and "form" that the nouns closely follows these words are the determinant for the verb form, specifically, plural or simple ). In answer D, "they are so genetically similar to one another" is correctly used in here, because the idiom"one another" is similar to "each other" only that the former is used when there are two things mentiond while the latter one is used when there are more than two thing mentioned. They works like "among" and "between". For some guys, until you are 100 percent sure about why the right one is right, please stop misguiding others,or please do not pretend to be an authority. I can't stand that any more... -- by 会员 andrewsoo (2011/9/6 0:08:42)
andrewsoo is right. The answer should be D. Appreciate your explanation, andrewsoo! |