单项选择题

A plastic wheel can be as tough as a metal one.

A．useful
B．tight
C．weak
D．strong
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单项选择题
The company recommendedthat a new gas station be built here.
A．ordered
B．insisted
C．suggested
D．demanded
单项选择题
We tried to restrictour conversation to arguments relevant to the topic.
A．put
B．suit
C．confine
D．resort
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