3.6Tom or his sister are going to visit the Great Wall some time next week.are 错了 应该改为 为什么

问题描述:

3.6Tom or his sister are going to visit the Great Wall some time next week.
are 错了 应该改为 为什么

or改为and

are---is 主语是单数

tom或者他妹,指的是一个人,所以用is