Air is the mixture of gases in which ______ the gas is oxyen.

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问题 Air is the mixture of gases in which ______ the gas is oxyen.

选项 A、not every of
B、not all
C、none of
D、all of

答案B

解析句义为“空气是一种混合气体，因为所有的气体不全是氧气”，所以用not all，而C项none of一般修饰人。

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