She didn’t know__________she could express her ideas clearly when she was invited to speak at the meeting.
A．whatB．whyC．how D．whether
C

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。
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