—IjustsawPeterinthelibrary.—It

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—I just saw Peter in the library.

—It _______ be him. He is studying in the classroom.

A．needn't B．mustn't C．shouldn't D．can't

句意：——我刚在图书馆看见彼得。 ——不可能是他。他在教室里学习。

A. needn't意为“不需要”；B. mustn't意为“禁止”；C. shouldn't意为“不应该”；D. can't不可能。根据答语He is studying in the classroom. 他在教室里学习。可知，前面应该是否定的推测，用can’t be不可能，故选D。