4．Please quiet! The baby is sleeping． A．be B．to be C．being D．am——青夏教育精英家教网——

摘要：4．Please quiet! The baby is sleeping． A．be B．to be C．being D．am

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Please ________ quiet! The baby is sleeping.

[　　]

A．be

B．to be

C．being

D．are

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