The situation today is obviously quite different from __it was 50years ago
问题描述：
The situation today is obviously quite different from __it was 50years ago
Awhat B when C which D such
我不太懂 顺便说一下这个地方是个什么从句
答
what=sth that 即为 the situation that 你可以把它代入句子中去
是宾语从句