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    ________ is known to all is that effective measures should be taken to deal with the problem of the over-exploiting of our resources.

           A. It                      B. What                        C. As                           D. Which

    B  考查名词性从句。分析题干结构“        is known to us all”是主语从句，从句中缺少主语，what引导主语从句，在从句中作主语。如果选it，需去掉all后的is;如果选as;需去掉is that。句意为“众所周知，面对过度开发资源的问题，我们应该采取有效的措施。”【教学启示】相似句型的混淆。as作为关系代词引导的非限制性定语从句位于主句之前时，从句与主句之间要用逗号隔开。It作为形式主语将that 引导的主语从句后置时，that常常不能省。

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