Question

—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

Answer

A

【解析】

试题分析：句意：――迈克，昨天晚上8：00你父母在做什么？――当爸爸在玩电脑游戏时，我妈妈在看书。A. while当……时；B. when当……时；C. unless 如果不，除非；D. as long as只要；从语境可以推测出这里是“当……时”，故C、D错了。When后跟延续或非延续性动作，不进行时间对比；while后跟延续性动作，与主句进行鲜明的时间对比。本题“当爸爸在玩电脑游戏时，妈妈在看书”。在对两人的行为进行时间对比，用while。故选A。

考点：考查连词辨析。