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

分类: 作业答案 • 2022-03-02 18:44:02

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.

答

是before 之前的事情,是过去时