单项选择题

"If we fail to act now," said Tom, ______ "we'll find ourselves ______ this later on."

A．pay back
B．pay for
C．pay up
D．pay off
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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
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
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