Question

where是什么从句？The two-child policy for couples where either the

Answer 1

引导的是一个定语从句，where表示模糊地点。即 they are both born in a single child family in policy. 用that肯定是不对的，that 可做关系副词，但仅指替表时间的词。 还有， a sudden in crease in population 这里应该是你打错了 ，正确的应是 a sudden increase in population . 有不懂再问吧。