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

All individuals are required to ______ to the laws made by their governments.

A．obey
B．conform
C．concede
D．' observe

单项选择题

Many of the scientists and engineers are judged ______ how great their achievements are.

A．in spite of
B．in ways of
C．in favor of
D．in terms of

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