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She didn’t know__________she could express her ideas clearly when she was invited to speak at the meeting.

A.what B.why C.how D.whether

C

解析试题分析:句意:当她被请去会议上发言时,她不知道她怎样表达清楚。what什么;why为什么;how怎样;whether是否。根据题意,故选C。
考点:考查宾语从句连词的用法。

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