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
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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