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

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; what
D. when; that

A. that; whatB. that; thatC. when; whatD. when; that解析：句意：直到天黑他才发现他想到的是解决问题的正确的方法。第一空填that，这是强调句，It was not until that…，第二空填what，在found后面的宾语从句中，what he thought是主语从句，主语从句中缺少主语，用what引导主语从句，选A。

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