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Although biologists have made tremendous progress in mapping the human genome, the genetic roots of most common diseases remained largely elusive.
(A) remained
(B) had remained
(C) remain
(D) are remaining
(E) remains
解释：
Remember that verb tenses should be consistent within a sentence.
Choice (C) is correct. It avoids the verb tense error of the original. The past tense verb “remained” is not consistent with the present perfect tense verb “have made” and should be changed to the present tense verb “remain.”
正确答案是C。
A Raisin in the Sun won for its author Lorraine Hansberry the distinction of being the first African American to receive the New York Drama Critics’ Circle Award.
(A) of being the first African American to receive
(B) to be the first African American receiving
(C) of the first African American to receive
(D) that she had been the first African American to receive
(E) that she was to be the first African American having received
解释：
Note that the sentence describes a particular distinction won by Lorraine Hansberry.
Choice (A) is correct. It avoids the errors of the other options by using the idiomatic “distinction of being” to express what the play “won for its author Lorraine Hansberry.”
正确答案是A
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