单项选择题

The manager told us never to ______ till tomorrow what we can do today.

A. come up
B. put off
C. turn on
D. give out
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The children are getting more and more excited when Christmas is ______ near.
A. drawing
B. joining
C. taking
D. operating
单项选择题
The machine will continue to make much noise ______ we have it repaired.
A. when
B. because
C. if
D. unless
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