单项选择题

Some people think that CD-ROMs will soon be ______ books.

A． as more popular as
B． as popular than
C． more popular than
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单项选择题
He forgot ______ the bottle first before ______ the medicine.
A． to shake; taking
B． shaking; to take
C． to shake; to take
单项选择题
He didn't know ______ is more difficult between maths and physics.
A． which
B． that
C． where
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