有个选择题 大家帮帮忙 Just after going to bed,------.
问题描述：
有个选择题 大家帮帮忙 Just after going to bed,------.
Just after going to bed,------.A. John heard someone knocking at the door. B. someone was knocking at the door C.the door was knocked at by someone D. there was a knock on the door
ples tell me why.thanks you all
答
A.首先前面那个分句省略了主语和谓语,完整的应该是just after John went to bed,只有分句和主句的主语一致时才可以这样省略,所以主句的主语一定要是John,只能选A了.