B
It is time ( about time ，high time ) that ...
该句型中that 后的从句应该用虚拟语气，值得注意的是① 常用过去时态表示虚拟．② 有时也用should 动词原形，should 不能省，常译为”是（正是）．．．的时侯．．．”
It is time that children should go to bed.
= It is time that children went to bed.
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