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

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问题 ______ the end of last year they had planted 4,000 trees.

选项 A、At
B、By
C、To

答案B

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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