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:
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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