用所给词的适当形式填空1.I heard Li Lei _____(write) five letters to his friends since last month.

用所给词的适当形式填空1.I heard Li Lei _____(write) five letters to his friends since last month.
其他人气:433 ℃时间:2020-05-06 15:16:33
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I heard Li Lei _had written____(write) five letters to his friends since last month.
在听说之前动作已完成,所以用过去完成时
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