By the time he came.I-----(complete)the work.我已经知道答案,我是初学者.

问题描述:

By the time he came.I_____(complete)the work.我已经知道答案,我是初学者.
1个回答 分类:英语 2014-10-29

问题解答:

我来补答
had completed
因为by表示完成时
 
 
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