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.
问题描述:
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.
答
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