Noboby except his parents （have) been to Beijing in the last two days.我觉得就填have,但正确的has我十分不解,我记得好像Noboby,something,noting等词后用单数.但是这里有个his parents .
网友回答
Noboby,something,noting等词后用单数；这里的his parents是由介词except连接的,不能决定动词,即谓语动词由介词前面的不定代词Noboby决定,所以用has
======以下答案可供参考======
供参考答案1:
主语是谁，动词就随谁。本句主语是nobody。