He doesn't know _____ his father is so worried about him 为什么填why为什么不填what

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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 为什么填why为什么不填what
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 为什么填why为什么不填what
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

给你两个句子就明白了

  1. He does not know why his father is  so worried about him

    他不知道为什么老爸如此担心他

  2. he does not know what his father is worried about

    他不知道老爸在担心什么

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