题目内容
【题目】—Look! A book is on the floor. Whose is it?
—It ________ be Rick's. It has his name on it.
A. Mustn'tB. can'tC. mustD. need
【答案】C
【解析】
句意：——看，一本书在地板上，它是谁的？——它一定是瑞克的，上面有他的名字。A. Mustn't一定不；B. can't不能，不可能；C. must必须，一定；D. need需要；根据It has his name on it.可知是一定是他的；故选C
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