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
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单项选择题
The higher the standard of living and the greater the national wealth, ______.
A．the greater amount of paper is used
B．the greater is the amount of paper is used
C．the greater the amount of paper used
D．the amount of paper used is greater
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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