单项选择题

The hijackers should have been arrested ______ instead of being allowed to leave.

A．on the spot
B．on the side
C．in the sight
D．on the screen
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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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