Question

【题目】-- Did you have a discussion with him about the matter?

--- No. When I saw him, he________ his history project busily.

A. has prepared B. prepares C. was preparing D. prepared

Answer 1

【答案】C

【解析】句意：——你和他关于那个问题讨论过了吗？——没有。当我看见他时，他正在忙碌地准备历史项目。When引导的时间状语从句，用一般过去时，主句用过去进行时was/were doing，故选C。