单项选择题

Sick ______ she was, she has to prepare food for the whole family.

A．although
B．as
C．because
D．for
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单项选择题
I wonder who wiped the windows so clean. Your mum ______ it, for she was out the whole day.
A．couldn't do
B．mustn't do
C．shouldn't have done
D．couldn't have done
单项选择题
The United States is trying to ______ the serious problems created by the energy crisis.
A．put up with
B．submit to
C．comply with
D．cope with
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