单项选择题

My father is good at solving this kind of problem. If only he ______ here!

A．were
B．will be
C．was
D．is
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单项选择题
The engine is ______ at 6,000 revolutions per minute.
A．turning in
B．turning off
C．turning over
D．turning to
单项选择题
From the way you are talking I can only ______ the conclusion that you are not the slightest bit interested in the project.
A．draw
B．arrive
C．come
D．take
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