单项选择题

If only I ______ how to operate an electronic computer as you do.

A. had known
B. would know
C. should know
D. knew
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单项选择题
An increase in a nation's money supply, without an accompanying increase in economic activity, ______ result in higher prices.
A. tends
B. tends to
C. tending to
D. will tend to
单项选择题
______ the danger from enemy action, people had to cope with severe shortage of food, clothing, fuel, and almost everything.
A. As to
B. As usual
C. As regards
D. As well as
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