单项选择题

The answer this question is known ________ us all.

A．to ;by
B．of; to
C．of; of
D．to; to
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单项选择题
Look! The house's ________ fire. Let's get some help.
A．been caught
B．catching
C．caught
D．been catching
单项选择题
______ I can see, the two wheels which are supposed to turn round do not turn atound.
A．As long as
B．As far as
C．So long as
D．As soon as
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