-Who are the teenagers gathering at the school gate? -Well, if you know, they are all my visi——青夏教育精英家教网—

摘要：-Who are the teenagers gathering at the school gate? -Well, if you know, they are all my visiting students. A. shall B. can C. may D. must

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－Who are the teenagers gathering at the school gate?

－Well, if you _____ know, they are all my visiting students.

A. shall　　B. can　　C. may　　D. must

－Who are the teenagers gathering at the school gate?

－Well, if you ____________ know, they are all my visiting students.

A．shall B．can C．may D．must

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