2-13.Our physics teacher told us that light travelled much faster than sound.back to错了 应该改为 为什么~

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2-13.Our physics teacher told us that light travelled much faster than sound.back to错了 应该改为 为什么~

2-13.Our physics teacher told us that light travelled much faster than sound.back to错了 应该改为 为什么~
2-13.Our physics teacher told us that light travelled much faster than sound.
back to错了 应该改为 为什么~

2-13.Our physics teacher told us that light travelled much faster than sound.back to错了 应该改为 为什么~
travelled ---> travels
是事实,所以用一般现在式

大哥 哪有back to 啊