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问题: 虚拟语气

it's time i met tom(did my homework),i have to go now.
为什么从句要用虚拟语气呀!

解答:

it's time i met tom(did my homework),i have to go now.
It’s(high)time:后定语从句中用虚拟语气
It’s time后的定语从句中常要用虚拟语气,谓语动词相当过去时的形式