题目内容

—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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