She didn’t know ________ to express her ideas in English clearly in public.A) which B) why C) what D) how

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She didn’t know ________ to express her ideas in English clearly in public.
A) which B) why C) what D) how

D她不知道如何在公共场合用英语表达自己的想法!
疑问词+不定式作了know的宾语
其它意思不对,A是哪一个,B是为什么 C是表达什么,所以都不对