—When did you go to Beijing? —I (might have been/must have been)there in 1994, but I can't remember it clearly.

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1. —When did you go to Beijing?
—I (might have been/must have been)there in 1994, but I can't remember it clearly.

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外研版（2019）高中英语必修二Unit 2 Period 2同步练习1