单项选择题

______is known to everybody, the moon travels round the earth once every month.

A．It
B．As
C．That
D．What
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单项选择题
The weather turned out to be very good, ______was more than we could expect.
A．what
B．which
C．that
D．it
单项选择题
______ to do the work, I should do it some other day.
A．If were I
B．I were
C．Were I
D．Was I
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