【題目】I have been to the Science Museum three times __________ the end of the year.
A.at
B.in
C.by
D.on

【答案】C
【解析】句意：到年底我已經(jīng)去過科學博物館3次了。at the end of在……末端，指時間點或者地點；by the end of到……是為止，通常用完成時態(tài)。in the end最后。根據(jù)句子的時態(tài)可知選C。

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