—Ididn’tseeyouatthepartylastnight?   —I       onmybiol...

問題詳情：

 —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

知識點：動詞時態

題型：選擇題