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
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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
单项选择题
It worried me that the letter had not arrived, especially ________ it had never happened before.
A．when
B．that
C．as
D．which
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