—Mike,whatwereyourparentsdoingat8:00lastnight?—Mymother...

問題詳情：

— Mike, what were your parents doing at 8:00 last night?

— My mother was reading _________ my father was playing computer games.

A. while             B. when                     C. unless                     D. as long as

【回答】

A

知識點：連詞

題型：選擇題