—Ididn’tseeyouatthepartylastnight?   —I       onmybiol...

问题详情：

 —I didn’t see you at the party last night ?

    —I        on my biology report at that time.

    A. worked    B. work   C. was working   D. am working

【回答】

C

知识点：动词时态

题型：选择题