Not until he walked into the classroomthat he left his dictionary at home.A. did he findB

问题补充：

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

A. did he find

B. had he found

C. he had found

D. he found

答案：

A. did he find

B. had he found

C. he had found

D. he found

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。