摘要：1627] -----You look tired. -----Yes, I non-stop until seven o’clock. [译文] --你看起来有点疲倦. --是的.我一直没停工作到七点钟. A. am working B. was working C. has worked D. had worked [答案及简析] B. 强调工作延续到七点.不能用完成时态.

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