Most American cities put their rubbish in the ground.But NewYork and a few other cities put _ in
问题描述：
Most American cities put their rubbish in the ground.But NewYork and a few other cities put _ in
the ocean.A them B.it C those D that,为什么要选择D,为何it 不对呢?
答
that用在相同句型里指代前文出现过的部分,it指代不明