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
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
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
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