单项选择题

As we were ( ) giving up hope, a letter arrived.

A.on
B.for
C.to
D.in
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单项选择题
Already there are many ( ) fuel vehicles on the market, powered by anything from solar power to natural gas.
A.alterable
B.alternate
C.alterative
D.alternative
单项选择题
You must believe that all your efforts taken for the project will （）.

A.pay up
B.pay over
C.pay off
D.pay out
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