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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:580

— Have you solved your problem?
— I’ve kept on thinking about that matter__________, but I have had no idea.

A.at times B.some time
C.at a time D.all the time
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—Haveyousolvedyourproblem?—I’v