Our teacher said soundmuch more slowly than light.A. was traveling B. travelsC. has travel

问题补充：

Our teacher said soundmuch more slowly than light.

A. was traveling

B. travels

C. has traveled

D. traveled

答案：

A. was traveling

(答案→)B. travels

C. has traveled

D. traveled

解析：此题考查宾语从句的时态问题。当主句的谓语动词是一般现在时时，其宾语从句的时态可以是任何适当的时态。所以，宾语从句的时态应根据实际情况而定。当主句的谓语动词的时态是一般过去时的时候，其宾语从句的时态一般要用任一适当的过去时态。但是当宾语从句是表达客观真理和规律的句子时，其时态仍旧用一般现在时。