Question

-What were you doing when I phoned you yesterday evening?

-I was doing homework while my parents       dinner,grandma.

A.cooked            B.cook            C.were cooking

Answer

C

【解析】

试题分析：句意：——昨天晚上当我给你打电话时，你们正在做什么？——奶奶，我正在做作业，而我的父母正在做饭。根据问句What were you doing可知此处用过去进行时were/was doing sth。 故选C。

【考点定位】考查过去进行时的用法。