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单选题公共英语一级

2010-07-31

__________the end of last year they had planted 4,000 trees.

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参考答案

B

答案解析

本题考查介词。by the end of意为“到…为止”，它要求动词用完成时态。at the end of意为“在…末期／末尾／末端”，它要求动词用简单时态(一般现在时或一般过去时)。

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