单项选择题

______ was once regarded as impossible has now become a reality.

A．What
B．That
C．Which
D．As
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单项选择题
______, we decided to leave at once, as we didn't want to risk missing the bus.
A．As it being pretty late
B．It being pretty late
C．It was being pretty late
D．Being pretty late
单项选择题
We consider ______ the instrument be adjusted each time it is used.
A．that it necessary
B．it necessary that
C．necessary that
D．necessary of it that
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