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

问题补充：

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

A. when; that

B. that; that

C. when; what

D. that; what

答案：

A. when; that

B. that; that

C. when; what

(答案→)D. that; what

解析：考查复杂句：第一空填that，It it not until...that... 是强调句“直到...才”，第二空填what，引导主语从句：what he thought “他所想的”句意：直到天黑，他才发觉他刚才所想的解决问题的方法是正确的。选D。