【题目】It was not until darkhe foundhe thought was the correct way to solve the problem.
A.that；what
B.that；that
C.when；what
D.when；that

【答案】A
【解析】第一个空考查的是强句型，第二个空考查的是由what引导的宾语从句，且what在宾语从句中又引导了一个小主语从句。