-- Is it your brother playing football ...

-- Is it your brother playing football outside?

-- It ________ be him. He is helping mother with dishes now.

A．must

B．can’t

C．mustn’t

D．can

B 【解析】试题分析：must必须，一定；can’t不能，不可能；mustn’t禁止；can能。句意：是你的哥哥正在外边踢足球吗？——不可能是他。他现在正在帮妈妈洗盘子呢。故选B。考点：情态动词

考点分析：

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