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
Unexpectedly the light ______ and we were left in. darkness.
A．burn out
B．put out
C．turned out
D．went out
单项选择题
The last half of the nineteenth century ______ the steady improvement in the means of travel.
A．has witnessed
B．was witnessed
C．witnessed
D．is witnessed
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