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高中英语She couldn't sleep last night,___explains why she was in

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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
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