Question

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

Answer 1

A 

試題分析：句意：直到天黑他才發現他想到的是解決問題的正確的方法。第一空填that，這是強調句，It was not until that…，第二空填what，在found后面的賓語從句中，what he thought是主語從句，主語從句中缺少主語，用what引導主語從句，選A。