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

解析試題分析：句意：當(dāng)她被請去會議上發(fā)言時，她不知道她怎樣表達(dá)清楚。what什么；why為什么；how怎樣；whether是否。根據(jù)題意，故選C。
考點：考查賓語從句連詞的用法。

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