Are you sure you (clean)them yesterday

问题描述:

Are you sure you (clean)them yesterday
用所给动词的适当形式填空。
A.Are you sure you ▁▁▁▁ (clean)the shoes?
B.Yes,I▁▁▁▁(clean)them yesterday
不好意思,打错了

都用cleaned ,第一句sure后面省略了一个that其实是宾语从句