She didn’t know______to express her ideas in English clearly in public.

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问题 She didn’t know______to express her ideas in English clearly in public.

选项 A、which
B、why
C、how
D、what

答案C

解析考查疑问词与不定式结构。疑问词who，what,which，when，where和how后加不定式可构成一种特殊的不定式短语。它在句中可以用作主语、宾语、表语和双宾语等。本题是该结构作宾语的情况。故选C。

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