The teacher said that light____ much faster than sound.A.travelled B.travels C.will travel D.is travelling

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• The teacher said that light____ much faster than sound.A.travelled B.travels C.will travel D.is travelling
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• go to another part of the country.这个句子用of the country我不清楚,
• She said that light ____ much faster than soundA.travel B.travels C.traveled D.traveling但是不是说要前后时态统一吗?怎么不是C?