Our teacher said to us that the earth around the sun.A. travelledB. travelsC. is travelin

问题补充：

Our teacher said to us that the earth around the sun.

A. travelled

B. travels

C. is traveling

D. was traveling

答案：

A. travelled

(答案→)B. travels

C. is traveling

D. was traveling

解析：通过分析句子结构，可知这个句子中包含一个宾语从句，且“地球绕着太阳转”这是一个客观的真理，故用一般现在时。