—Asweknow,youwon’tgobacktotheU

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更新 2022-09-03
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—As we know, you won’t go back to the USA since you have established a research center here．But how long _____ in America?
—For almost 10 years．

A．did you study	B．have you studied
C．were you studying	D．have you been studying

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从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
We ____last night, but we went to the concert instead.
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It is reported that the United States uses ______ energy as the whole of Europe.

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