单项选择题

You have to go to work on Sundays often, ______

A．doesn't he
B．don't you
C．mustn't you
D．haven't you
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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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