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
His proposal that a special committee ______ to investigate the incident was flatly denied by the director of the bureau.
A. was set up
B. be set up
C. set up
D. being set up
单项选择题
______ the two, Mary is ______ dancer.
A. Of, the more gifted
B. Of, more gifted
C. In, the more gifted
D. In, more gifted
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