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问题: 英语选择题

____the letter,I went out to post it.
A Writing B Having written
C To write D Written
选哪个?为什么

解答:

就选 B 吧
B项从时态上讲是从句的时态发生在主句之前,即先写信,再寄信.

从现在分词方面来讲是,现在分词的完成式有因果关系,或者动作的先后次序问题.

希望能帮到你!