单项选择题

Tell him he should stop ______ and get some sleep.

[A] worry
B. worrying
C. to worry
D. from worrying
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单项选择题
______she is young, she knows quite a lot.
[A] Although
B. However
C. When
D. Unless
单项选择题
Just then we had an important piece of work in hand, the generator that supplies the power to the whole works broke ______ .
A. out
B. up
C. off
D. down
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