单项选择题

ff either of you had been able to ______ your anger, the fight would have been avoided.

A．keep back
B．hold back
C．give off
D．work up
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单项选择题
Of great significance the nation-wide movement is ______ the Kampuchean people in their heroic struggle against the aggression of the Vietnamese.
A．to support
B．for supporting
C．supporting
D．of supporting
单项选择题
After people have learned that magnets attract things, centuries passed ______ they took note of the fact that magnets sometimes also repel things.
A．before
B．until
C．after
D．since
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