It was not easy for us to understand that( ) when we were yo

It was not easy for us to understand that(truth) when we were young
再问： 选择题 A the moon goes around the earth B the sun travels around the earth C the sun turned around the moon D the earth went around the sun
再答： A the moon goes around the earth
再问： 不可以用B吗
再答： the earth travels around the sun. 地球绕太阳转 不是 B the sun travels around the earth 太阳绕地球转
再问： 唉 地理没学好，那月亮绕地球转吗
再答： 恩 A是月亮绕地球转