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6．--Look! Jack is crossing the street．--It be him．He's in Beijing and he won't he back until Friday．A．may B．can C．can't D．mustn't 【查看更多】

 

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--Look! Jack is crossing the street．

--It ________ be him．He's in Beijing and he won't he back until Friday．

A．may       B．can        C．can't        D．mustn't

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