单项选择题

It was a long time ______ the neighbors found that the old lady bad been dead of cold.

A．when
B．until
C．since
D．before
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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
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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