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单选题
Make sure you hear the boarding music when you press the button.
A
Make sure you press the switch when you hear the boarding music.
B
Make sure you press the switch after you hear the boarding music.
C
Make sure that you hear the boarding music after you push the button.
答案解析
正确答案：C
相关知识点：
按按钮确保听到登机音乐
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