单项选择题

The country's chief exports are coal, cars and cotton goods, cars ______ the most important of these.

A．have been
B．are
C．being
D．are being
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单项选择题
He is not under arrest, ______ any restriction on him.
A．or the police have placed
B．or have the police placed
C．nor the police have placed
D．nor have the police placed
单项选择题
Mr. White works with a chemicals import & export company, but he ______ for the industrial fair, since he is on leave.
A．has worked
B．works
C．has been working
D．is working
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