the air in the country is cleaner than ___ of a citya.it b.that为何选B?

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the air in the country is cleaner than ___ of a city
a.it b.that
为何选B?

that 代指前面出现的air啊,这句话是说乡村的空气比城市好~

B

这是固定搭配,that代指the air,你记住以后出现类似题目都选that。