单项选择题

______, he could not cover the whole distance in fifteen minutes.

A．Fast as he can run
B．As he can run fast
C．if he can run fast
D．Since he ran fast
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单项选择题
Agricultural production in that country has increased ______ in recent years.
A．vastly
B．strikingly
C．considerably
D．extremely
单项选择题
______ a good beginning is made, the work is half done.
A．As soon as
B．While
C．As
D．Once
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