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。