单项选择题
Agricultural production in that country has increased ______ in recent years.
A．vastly
B．strikingly
C．considerably
D．extremely
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单项选择题
Many countries are increasing their use of natural gas, wind and other forms of ______ .
A．energy
B．source
C．power
D．material
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单项选择题
We didn't know his telephone number, otherwise we ______ him.
A．would telephone
B．would have telephoned
C．had telephoned
D．must have telephoned
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