When did you ________ from Beijing tomorrow?

You look sleepy. You’d better ________

A.go
B.be
C.sleep
D.go

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下列哪项主要是慢性阻塞性肺病的病因?()

A.支气管哮喘
B.慢性支气管炎
C.支气管扩张
D.肺结核

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