Question

The teacher told us that light ________ faster than sound．

1. A.
   travelled
2. B.
   has travelled
3. C.
   travels
4. D.
   was travelling

Answer 1

C
直接引语如果是客观事实或真理，变为间接引语时，不管主句用什么时态，间接引语的时态不变。