情境11:David妈妈昨天下班回家已经7点了。她看见李宁在玩游戏,有些生气。李宁解释道他是在完成作业后才开始打游戏的()
A.Davidhadfinishedhishomeworkby7o’clockyesterday
B.Davidfinishedhishomeworkby7o’clockyesterday
C.bothsentencesinAandBaretruedescriptions
D.Don’tknow
A、Davidhadfinishedhishomeworkby7o’clockyesterday