单项选择题

You should know better than ______ the risk of gambling.

A．to run
B．running
C．to have run
D．ran
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单项选择题
The unrighteous officer prefers to resign ______ part in such dishonest business deals.
A．than take
B．than to take
C．rather than take
D．rather than to take
单项选择题
Mary ______ that the purchase had been a mistake. However, she didn't.
A．ought to acknowledged
B．ought to have acknowledged
C．should acknowledge
D．should be acknowledging
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