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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单项选择题
With all its advantages, the artificial intelligence is by no means without its
A．boundaries
B．restraints
C．confinements
D．limitations
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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