I don't know what is the matter 如何区别疑问词作主语?

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Idon''tknowwhatisthematter如何区别疑问词作主语?Idon''tknowwhatisthematter如何区别疑问词作主语?Idon''tknowwhatisthematter如何区

I don't know what is the matter 如何区别疑问词作主语?
I don't know what is the matter 如何区别疑问词作主语?

I don't know what is the matter 如何区别疑问词作主语?
此句中what引导一个宾语从句.what is the matter, what's wrong作从句时,what都作从句的主语.