【选择题】有关It is high time that...句型

【选择题】有关It is high time that...句型

题目
【选择题】有关It is high time that...句型
It is high time that effective measures ______ taken to reverse this disturbing trend.
A.be B.were
选哪个,请说明理由谢谢!
答案
答案选B.were
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.如:
  It is time that the children went to bed.
  It is high time that the children should go to bed.
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