单项选择题

They are going downtown ______ bus instead of ______ their bikes.

A．by; by
B．on; by
C．by; in
D．by; on
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单项选择题
She was so angry at all ______ he was doing ______ she walked out without saying a word.
A．that; that
B．which; that
C．what; as
D．that; which
单项选择题
Every minute must be made full use of ______ our lessons, for the college entrance exam is coming.
A．going over
B．to go over
C．go over
D．our going over
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