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She tried ( ) her nervousness as she waited to make her speech.
A、to hold up
B、to hand over
C、to cover up
D、to put up
【正确答案】：C
【题目解析】：cover up 掩饰，hold up 坚持，put up 系上，hand over 递交，句子含义在等待演讲时，她试图掩饰她的紧张。