问题
选择题
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
答案
答案：C
题目分析：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。