jack __into the house when no one___A slipped ; was lookingB had _英语解答

jack __into the house when no one___
A slipped ; was looking
B had slipped ; looked
C slipped ;had looked
D was slipping ;looked
为什么选A

人气：321 ℃　时间：2019-10-11 19:42:48

解答

looked表被动,句子意思是当时没有人看他!而且when表明是当时正在发生的事,所以直接排除BCD,选A!