【题目】It was not until dark ________ he found ________ he though was the correct way to solve the problem.
A. that; what B. that; that
C. when; what D. when; that
在线课程【答案】A
【解析】
试题分析：考查强调句型和宾语从句。本句第一空考查了强调句型，强调的是时间状语not until dark；第二空考查了宾语从句，what引导起动词find后面的宾语从句，并在句中作主语。句意：直到天黑他才发现了他认为是解决这个问题的正确方法。故A正确。