高中英语She couldn't sleep last night,___explains why she was in such a bad mood this morning.A which B for which C when D to which我觉得是选B.因为没缺主语吧.She couldn't sleep last night应该就是主语.

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高中英语She couldn't sleep last night,___explains why she was in such a bad mood this morning.A which B for which C when D to which我觉得是选B.因为没缺主语吧.She couldn't sleep last night应该就是主语.
高中英语She couldn't sleep last night,___explains why she was in such a bad mood this morning.
A which B for which C when D to which
我觉得是选B.因为没缺主语吧.She couldn't sleep last night应该就是主语.

高中英语She couldn't sleep last night,___explains why she was in such a bad mood this morning.A which B for which C when D to which我觉得是选B.因为没缺主语吧.She couldn't sleep last night应该就是主语.
A.
此处属于非限定性定语从句.起补充说明作用,缺少也不会影响全句的理解.
在非限定性定语从句的前面往往有逗号隔开,如若将非限定性定语从句放在句子中间,起前后都需要用逗号隔开.
引导非限定性定语从句的关系代词
指代对象 指代人 指代物
主格 who which,as
宾格 whom which,as
所有格 of whom,whose which,of which,whose

A,这时非限定性定语从句。which 指代She couldn't sleep last night

我觉得是A,缺主语吧,后半句主谓宾,逗号都分开了,没逗号的话那个是主语,嘿,好像是

选A