【題目】---How long have they ____________ Shanghai?

---About a week.

A. been to B. gone to C. left D. been in

【答案】D

【解析】句意：——他們在上海待了多長時間了？——大約一周。have been to去過，表示去了某地回來了，是瞬間性動詞；have gone to去了，表示去了某地還沒有回來，是瞬間性動詞；left離開，是瞬間性動詞；have been in在…..，是延續(xù)性動詞；與how long時間段連用，用延續(xù)性動詞，故選D。

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