题目内容
—Look! A book is on the floor. Whose is it?
—It ________ be Rick's. It has his name on it.
A. Mustn't B. can't C. must D. need
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题目内容
—Look! A book is on the floor. Whose is it?
—It ________ be Rick's. It has his name on it.
A. Mustn't B. can't C. must D. need