It was not until dark he found he thought was the correct way to solve the problem.A. that

问题补充：

It was not until dark he found he thought was the correct way to solve the problem.

A. that; what

B. that ; that

C. when; that

D. when ;what

答案：

A. that; what

B. that ; that

C. when; that

D. when ;what

解析：第一空考查强调句式的that，第二空用what是宾语从句中的主语。