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.

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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.
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.
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