单项选择题

The police are trying to () what really happened.

A．ascertain
B．assert
C．avert
D．ascribe

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单项选择题
(), you need to give all you have and try your best.

A．Being a winner
B．To be a winner
C．Be a winner
D．Having been a winner
单项选择题
Gun control is a subject () Americans have argued for a long time.

A．of which
B．with which
C．about which
D．into which
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