单项选择题

The USA is composed of 50 states, ______ are separated from the others by land or water.

A. two of these
B. of whom two
C. two of which
D. two of that
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单项选择题
Before the war broke out, many people ______ in safe places possessions they could not take with them.
A. threw away
B. put away
C. gave away
D. carried away
单项选择题
It was not long ______ the rain stopped and the bright sun came out again.
A. that
B. ago
C. before
D. until
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