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 doorples tell me why.thanks you all

A
Just after going to bed是Just after JHON went to bed的省略。句子的主语应是going to bed的逻辑主语。故选A。都上错误！

A, 前面是个时间状语,后面应该有主语.而且going to bed的主语应和后面的主语一致.
如果想把后面的主语改为门,或者somebody,那前面的going to bed 应加个逻辑主语,构成独立主格结构.比如:
Just after John going to bed,the door was koncked.

选A，主从句主语一定要一致。这句话里的Just after going to bed的主语一定是去睡觉和听见敲门声的那个人，只有A有这样一个主语。

D

A

肯定是A
因为逗号前的从句是个省略主语的短语
凭什么看主语呢
就凭从句里的动词是现在分词还是过去分词
going to bed 现在分词
说明主语肯定是个人
而四个选项中只有A的主语的人John

考察主谓一致.
going的发出者是John.
选A

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.

我选d

A. just after going to bed, 是分词短语，需要后面的John来接上。