Question

Not until he walked into the classroom　　　that he left his dictionary at home.

A. did he findB. had he found

C. he had foundD. he found

 

Answer 1

【解析】选A。考查倒装语序。此处not until置于句首, 主句应用倒装语序, 故首先排除C和D两项; 另外, 由句子时态是过去时可知此题选A。