单项选择题

She can't help______ the house because she's busy making a cake.

A．to clean
B．cleaning
C．cleaned
D．being cleaned
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单项选择题
Is this factory ______ you visited last Friday
A．which
B．where
C．the one
D．there
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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