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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1655

---Alice, you look puzzled, Have you understood it?
---Yes.I _____another problem just now.

A.l have thought of B.am thinking of
C.had thought of D.was thinking of
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Alice,youlookpuzzled,Haveyouun