Why didn't I think of that before?这里的助动词为何用didn't,而不用don't.

问题描述:

Why didn't I think of that before?这里的助动词为何用didn't,而不用don't.
1个回答 分类:英语 2014-09-20

问题解答:

我来补答
是before 之前的事情,是过去时
 
 
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