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
If wool is put into hot water, it tends to shrink.
A. disappear
B. expand
C. break
D. contract
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
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