--Hi,Grace,youlooktired. --I'mtired.I
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问题详情:
-- Hi, Grace, you look tired.
-- I'm tired. I ____________________ on my homework all day.
A. worked B. had worked C. have been working D. have worked
【回答】
C
知识点:现在完成进行时及其被动式
题型:选择题
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