Do you know who____(be) the first man to walk on the moon?是按照叙事那样用was呢,还是按照不变的事实来用is?

问题描述:

Do you know who____(be) the first man to walk on the moon?
是按照叙事那样用was呢,还是按照不变的事实来用is?

was
将do you know 看成是插入语

应该是was吧
不过我也不敢肯定,我们老师说在没有时间状语的情况下一般当作已经发生过了的·· 囧

用was