单项选择题

Problems like this ______ every day in the factory.

A．raise
B．rise
C．get
D．arise
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单项选择题
You can't afford to let the situation get worse. You must take ______ to put it right.
A．decisions
B．directions
C．sides
D．steps
单项选择题
The alarm clock didn't ring this morning. I ______ it last night.
A．did forgotten to wind
B．may have forgotten winding
C．ought to have forgotten to wind
D．must have forgotten to wind
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