sam with his friend helen______in class three .they are in class one.要给出理由,并且回答一下 .是Be动词适当形式填空

问题描述:

sam with his friend helen______in class three .they are in class one.
要给出理由,并且回答一下 .是Be动词适当形式填空

are,因为是两者所以用are