It's high time we________for our trip around the beautiful city.

问题描述:

It's high time we________for our trip around the beautiful city.
A start off
B started off
为什么选B?

虚拟语气,it's (high,right) time sb.did sth.后面的从句谓语动词要用过去式或用should加动词原形,但should不可省略.
It is time that the children went to bed.
It is high time that the children should go to bed.