—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
考察情態(tài)動詞用法。A千萬不能；B不必；C不可能，不能；D也許不；結(jié)合句意可知B正確。句意：—我必須明天歸還這本書嗎？—不，你不必；你可以再保留三天。
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