Generally speaking, the air pollution in cities is more serious than______in the country.

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问题 Generally speaking, the air pollution in cities is more serious than______in the country.

选项 A、ones
B、one
C、that
D、those

答案C

解析 对比结构中,对比对象中出现的重复名词用that或those代替,由此排除A项和B项。the air pollution是不可数名词,排除D项。故选C。
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