Must old people____in this cinema now?Why don't you go in and see it?

问题描述:

Must old people____in this cinema now?Why don't you go in and see it?
A.speak B.spoken C.be spokento D.be spoken
选什么

must是情态动词.must+动词原形 所以选A
老人们在这个电影了吗?你为什么不进去看看?