Question

【题目】By the time I got home, my parents _______ for half an hour.

A. have left B. had left C. have been away D. had been away

Answer 1

【答案】D

【解析】

句意：我到家时，我父母已经走了半个小时。leave离开，是短暂性动词；be away表示离开，表示状态，可以和for+一段时间连用。根据时间状语for half an hour.可知排除AB；根据By the time I got home可知，主语用过去完成时，其结构是had done的形式，根据题意，故选D。