单项选择题

The train came to an abrupt stop, making us wonder where we were.

A．an uncertain
B．a slow
C．an unexpected
D．a smooth
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单项选择题
Of all the planets in this solar system, Mercury is nearest the Sun.
A．most like
B．closest to
C．hotter than
D．heavier than
单项选择题
We tried to restrict our conversation to arguments relevant to the topic.
A．put
B．suit
C．confine
D．resort
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