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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单项选择题
The government ______ regulations that put this old city under protection.
A．published
B．issued
C．discharged
D．released
单项选择题
Unexpectedly the light ______ and we were left in darkness.
A．burn out
B．put out
C．turned out
D．went out
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