单项选择题

Look at the clock! It's time ______ work.

A．we started
B．we'll start
C．we're starting
D．we have started
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单项选择题
The manager showed the new employee ______ to find the supplies.
A．what
B．where
C．that
D．which
单项选择题
If the machine should ______, call this number immediately.
A．break down
B．set out
C．put on
D．go up
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