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

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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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There was a shortage of water in the area two months ago () hot weather.

A. by way of
B. in spite of
C. because of
D. by means of
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