为什么：there's less air pollution in the city than in the country.这里的than后面没有用that呢?
问题描述：
为什么：there's less air pollution in the city than in the country.这里的than后面没有用that呢?
the weather in wuhan is hotter than __that____in beijing.
答
there's less air pollution in the city than in the country这个句子是拿两个城市的空气污染作比较,比较的对象只有一个,所以不用再用that了