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问题: I received seven Christmas cards this morning before the lunch?为何不能把received改成had received?

解答:

had received 是过去完成时,是指从过去某一点前发生的动作或事情.而本句意思为今天早上午饭前我收到了七张圣诞卡,只是陈述发生在过去的一个事实,用一般过去时.