单项选择题

Slavery was () in Canada in 1833, and Canadian authorities encouraged the slaves, who escaped from America, to settle on its vast virgin land.

A．diluted
B．dissipated
C．abolished
D．resigned

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单项选择题
The police are trying to () what really happened.

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