usb供电线:--Did you see Sandy in the manager's office?

来源：百度文库编辑：杭州交通信息网时间：2024/05/07 04:22:48

--Yes,she__tohim why she was late again.
A. is explaining
B. was explaining

B 问句是过去时，而且why后面的部分也使用了过去时，可见这里应该是“我看到Sandy正在解释……”我看到是过去时，所以解释也应该是过去进行时。

A
根据问题中的did 指的是过去的事情
回答中的was和它对应
从理解上来说sandy一直在和manager解释所以造成她错过了已经过去的约会时间因此这个动作是一直持续到现在的
综上选A

B根据从句前后时态一般不变．自然就是was咯

选B，用过去进行时，因为是Did

若她仍在那则选a 若不在那选B

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