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
He is the most brilliant pianist ______ I have ever met.
A．which
B．that
C．who
D．whom
单项选择题
It was a long time ______ the neighbors found that the old lady had been dead of cold.
A．when
B．until
C．since
D．before
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