He must have done his homework last night,didn't he? 这里为什么用didn't而不用haven't?错了是 hasn't

分类: 作业答案 • 2022-01-02 13:53:19

问题描述：

He must have done his homework last night,didn't he? 这里为什么用didn't而不用haven't?
错了是 hasn't

答

He must have done his homework last night,didn't he? 这里为什么用didn't而不用haven't?错了 是 hasn't