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选择题有关Itishightimethat...Itishightimethateffectivemeasurestakentoreversethisdisturbingtrend.A.beB.were选哪个,请说明理由谢谢!

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【选择题】有关It is high time that...
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!
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答案和解析
B
虚拟语气还可用在定语从句中,表示:“早该做某事了”时,定语从句中的谓语动词须用虚拟语气,其虚拟语气的结构为:It is (high / about) time that + 主语+ 动词的过去式/ should + do(优先使用动词过去式),即从句用虚拟过去式