last term we had finished our experiments.A. At the end of B. By the end ofC. In the end of D. At a

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【题目】_________ last term we had finished our experiments.

A. At the end of B. By the end of

C. In the end of D. At an end

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【答案】B

【解析】

考查短语辨析。句意：到上学期末我们已经完成了我们的试验。因为主句用的是过去完成时态，所以应用by the end of。