What at nine o’clock last Sunday morning?A. was you doingB. were you doingC. are they doin

发布时间：2020-08-23 03:25:33

What      at nine o’clock last Sunday morning?
A. was you doing       B. were you doing           C. are they doing

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解析：此题重点考查过去进行时的基本用法，表示在过去某个时刻正在进行的动作或存在的某种状态。根据语境可知此句的含义上周日的早晨9点中你正在干什么。故用过去进行时。过去进行时的基本构成是was或were+ving，故选B。
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