By the end of last week, he______ (finish) his composition.had finished过去完成时的用法。

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问题 By the end of last week, he______ (finish) his composition.

选项

答案 had finished

解析过去完成时的用法。by在此表示“到……时(为止)”，与之连用的谓语动词常用完成时态。根据时间状语by the end of last week(到上周末为止)，需用过去完成时，表示在过去之前已经发生或完成的动作。

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Bytheendoflastweek,he______(finish)hiscomposition.hadfinished过去完成时的用法。