—Where were you at eleven o’clock this morning? —I beef with my father at home at that t

问题补充：

—Where were you at eleven o’clock this morning?

—I beef with my father at home at that time.

A. cook

B. am cooking

C. was cook

D. was cooking

答案：

A. cook

B. am cooking

C. was cook

(答案→)D. was cooking

解析：句意:-今天早上11点的时候你在哪里？-那个时候我正在家里和我的爸爸做牛肉。根据句意可知，这里说的是今天早上11点钟的时候发生的事，应该是说当时我正在做牛肉，故应该用过去进行时。故选D。Ａ选项是一般现在时；B选项是现在进行时；C选项的形式不对。