中文谷----Areyoutired,Ken?----Yes.Youknow,I
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問題詳情：
---- Are you tired, Ken?
---- Yes. You know, I _____ for almost 12 hours!
A. have been working B. am working C. had worked D. will work
【回答】
A
知識點：動詞時態
題型：選擇題
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