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15.________is required is that all the students should obey the school regulations.(  )
A.WhatB.AsC.ItD.Which

分析 要求所有学生应该遵守校规.

解答 答案:A.根据is that all the students should obey the school regulations所有学生应该遵守校规,可知前面是主语从句,主语从句is required 缺主语成分,所以What is required is that…正确,故选A,注意区别"It is 过去分词(said/thought/believed/reported/supposed) that…句型",据说,据报道…;As is required,…句型中as 引导非限制性定语从句.

点评 本题考查主语从句的连接词,在在充分分析句型基础上,同时熟知it is required that 与what is required is that 区别便不难选出此题答案.

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