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—Must I return the book tomorrow?
—No, you ________.You can keep it for three days.
A.mustn'tB.needn'tC.can'tD.may not
B
考察情态动词用法。A千万不能;B不必;C不可能,不能;D也许不;结合句意可知B正确。句意:—我必须明天归还这本书吗?—不,你不必;你可以再保留三天。
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