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问题 选择题
By the time he arrives in Beijing, we________ here for two days.

A. will have stayed    
B. have been staying    
C. shall stay    
D. have stayed

答案

答案：A

单项选择题

马克思认为，造成人片面发展的根本原因是( )。

A．人本身
B．社会
C．经济发展
D．分工
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单项选择题

A vessel in ocean service that does not have an approved means of processing oily bilge slops or oily ballast must have（）.

A.a fixed piping system for ballast discharge to a reception facility

B.a discharge outlet for the ballast system on each side of the weather deck

C.one portable adapter for a shore connection to the ballast line

D.All of the above
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