作业帮 > 英语 > 作业

He doesn't know _____ his father is so worried about him 为什么

来源:学生作业帮 编辑:搜搜考试网作业帮 分类:英语作业 时间:2024/07/16 07:25:59
He doesn't know _____ his father is so worried about him 为什么填why
为什么不填what
He doesn't know _____ his father is so worried about him 为什么
可以看从句的成分.
his father is worried about him,本身是一个完整的句子.what在句中要充当的是名词性成分,无法填入后面句中.所以只能填why.
相反,如果是He doesn't know __ his father is worried about,这样从句缺宾语,就应该填what