—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

 

【答案】

C

【解析】考查情態(tài)動詞的用法。mustn’t“禁止；不要”；can’t“不可能”；must“一定”；need“必要”。由下文句意“在上面有他的名字”可知，這本書一定是里克的。故選C。

 

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