单项选择题

Be careful. Don't () your drink on the table.

A. spill
B. spread
C. flood
D. flow

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单项选择题

Air is the mixture of gases in which () the gas is oxyen.

A. not every of
B. not all
C. none of
D. all of

单项选择题

I'm sorry I'm late, I was held up in a traffic ().

A. block
B. group
C. jam
D. bunch

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