选择it is getting late,it's time we ____

问题描述:

选择it is getting late,it's time we ____
.it is getting late,it's time we ____
A.go B.went C.are going D.must go 答案是B怎么理解时态?选D不行吗?

这是一个固定句型it's time we...意思是是时候该做什么了 后面要跟过去时 如果为it was time we...后面要跟完成时