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
To produce a mighty book, you must choose a great ______.
A．matter
B．topic
C．theme
D．thesis
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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