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
She has taken great pains to conceal her emotions, and thereby made them ______ conspicuous.
A．all the more
B．all the much
C．all more
D．all much
单项选择题
Robert says he bought these books in a ______.
A．disposal
B．sale
C．production
D．reduction
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