Because of the subway,_____easier for us to travel around the city.A:that is B:this is C:it isD we are 因该选哪个?原因?

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Because of the subway,_____easier for us to travel around the city.A:that is B:this is C:it is
D we are 因该选哪个?原因?

c it 在这里做形式主语代替to后面的内容

C
it's + a. + for sb. + to do sth.为固定句式,意思是:对某人来说,做...很...

C
it是形式主语,真正的主语是to travel around the city

选c 这是it作为形式主语的句子~~~