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
Even if you bad refused, the ______ would probably not have been very different.
A．effect
B．consequence
C．result
D．outcome
单项选择题
If I hadn't given you a hand in time of crisis, you ______ on air now.
A．couldn't have put
B．wouldn't be putting
C．didn't put
D．won't put
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