I shall paint the wall of my room green next Saturday if it doesn’t rain. It’s high time it ____.

It is (high) time that

选B.

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.或者
It is high time that the children should go to bed.

B 是它被做完成时候了

b
high time 后用一般过去时

B
it is (high) time 后面加过去式
而墙壁是被刷的，要用被动式

是B, high time 是早该的意思， 后边接过去式。

B

It’s high time ……后面接虚拟语气。房间是被刷 所以用被动

给你个例子吧：it is high time that we left 我们真的该走了。