一百多年来,不同肤色的劳动者用不同的语言,用同样的旋律,唱着《国际歌》,它的诞生与哪次运动有关( )
A:巴黎公社
B:宪章运动
C:十月革命
D:里昂工人起义
It's difficult to live in a foreign country, ______ if you can't understand the language there.