单项选择题

I was ______ the point of telephoning him when his letter arrived.

A．to
B．on
C．at
D．in
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单项选择题
Unexpectedly the light ______ and we were left in darkness.
A．burned out
B．put out
C．turned out
D．went out
单项选择题
Without computers, we ______ the tremendous medical advancement in the last few decades.
A．would not make
B．will not have made
C．could not make
D．couldn't have made
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