The manager or his assistant ( ) planning to go填哪个被动词啊?were?are?was?be

问题描述:

The manager or his assistant ( ) planning to go填哪个被动词啊?were?are?was?be
为什么不可以选BE啊
单数不可以选BE吗,BE是复数用的吗

因为OR 两者之一 是单数的意思