问题
选择题
It wasn’t 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
答案：D
题目分析:句意：直到天黑他才找出他认为正确的解决问题的方法。根据结构可知第一个空是强调句型，特点去掉it was……that 句子意思完整，通顺，排除A、C选项；第二个空是宾语从句的引导词，从句中缺少主语，that引导宾语从句不做成分，所以答案选D。