摘要：( )Must we keep the door open? I.You shouldn’t work too hard.
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—Must we keep the window open all the time?
A. No, you mustn’t B. No, you can’t. C. No, you don’t have to.
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—Must we keep the room_______ all the time?
—No, you don’t have to.
A.cleaning B.cleaned C. to clean D. clean
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—Must we keep the window _______ all the time?
—No, you don’t have to.
A.opening B.opened C. open
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