b 这里前半句表示时间状语 用having表示已完成 并且作为非谓语 因为句中已经有谓语went 了
所以去掉 d
并且要表示在 went out 发生之前 所以选b 排除A C排除A选项的理由是什么？时间关系呀 根据语义与逻辑是 写完信去寄 寄这个动作它用went 表示发生在过去 所以写信应该是比寄更早完成所以选 过去完成时的非谓语 having written
()the letter ,i went out to post it.A.writing B.having written C.to write D.written
()the letter ,i went out to post it.A.writing B.having written C.to write D.written
英语人气：202 ℃时间：2020-02-25 16:03:25
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