3．You smoke when you see the sign． A．must B．should C．mustn’t D．nee——青夏教育精英家教网——

摘要：3．You smoke when you see the sign． A．must B．should C．mustn’t D．needn’t

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You _________ smoke when you see the sign ．

A．must B．should C．mustn't D．needn't

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