单项选择题

The professor can hardly find sufficient grounds ______ his argument in favor of the new theory.

A．which to base on
B．on which to base
C．to base on which
D．which to be based on

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单项选择题

I apologies ______ her ______ my impoliteness.

A．with; to
B．to; for
C．for; to
D．on; for

单项选择题

Never before in China ______ for the farmers.

A．has so much been done
B．have so much been done
C．has been done so much
D．so much has been done

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