问题
选择题
I’m moving to the countryside because the air there is much fresher than ________ in the city.
A．ones
B．one
C．that
D．those
答案
答案：C
That代替上文出现过的同类单数可数名词或不可数名词。 One代替上文出现过的那一个单数可数名词或不可数名词。
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