过去的过去用过去完成时态,因为是先没有收到回信她才会再接着写一封 写信是发生在过去 所以前面没有收到信就用过去完成时态
having 不能省
ing形式是主动 或者进行在这里收信是主动 所以用ing不能直接说received
那样的是表达被动的
Not having received an answer ,she decided to write another letter .请问 having 为何 不能省略?
Not having received an answer ,she decided to write another letter .请问 having 为何 不能省略?
英语人气：936 ℃时间：2019-08-19 20:39:42
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