Question

China isn't the country _________ she used to be

50 years ago.
a. that b. which c. what d.since
选什么？为什么？分析下。

Answer 1

选A
that 引导定语从句
如选C，此题应是：China isn't _______she used to be 50 fifty years ago .

追问

为什么选 a ？还是不懂 ，先行词country 是物 我觉得that/which都行，分析下 。tks~