单项选择题

Oil （） 90 per cent of the country's exports.

A．consists of
B．reaches
C．accounts for
D．composes

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单项选择题
No one is （） to obey his boss unless he no longer wants to keep his position in the firm.

A．eager
B．unhappy
C．willing
D．reluctant
单项选择题
We consider it important that a plan （） before doing a work.

A．to be made
B．should make
C．be made
D．will be made
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