题目内容

——Alice, you look puzzled.Have you understood it?

——Yes, I ________ another problem just now.

A.have thought

B.thought

C.had thought of

D.was thinking of

 

答案:D
提示:

Alice说,我刚才正在想另外一个问题,所以会看起来很困惑。应该用过去进行时

 


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