It is high time that they started setting off on a trip ,这句话中为什么要用started ,

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It is high time that they started setting off on a trip ,这句话中为什么要用started ,
It is high time that they started setting off on a trip ,这句话中为什么要用started ,

It is high time that they started setting off on a trip ,这句话中为什么要用started ,
这是固定用法
it is (high) time that someone did something.

it is high time that did
这个是强调句句型

虚拟语气:It is (high) time that 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.

It's (high/about) time+ that--从句 从句用一般过去时,虚拟语气。如:
你该上学了。
It's high/ about time that you went to school.=It's time for you to go to school.