Itwasonlybeforehefinishedtheassignmentthat

问题详情：

It was only before he finished the assignment that ____ the answer to the last two questions.

     A. he thought out      B. did he think out  C. he did thought out  D. thought out he

【回答】

A

知识点：一般过去时及其被动式

题型：选择题