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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.What B.It C.As D.Which

A

解析试题分析:句意:众所周知的是应该采取有效的措施来处理过度开采资源的问题。分析句子成分可知,第二个is是谓语,前面的句子是主语从句,因为主语从句缺少主语,所以用what连接主语从句,It做的是形式主语,那么后面的is就要去掉,as引导的是非限制性定语从句,is就要改成逗号,which也是引导非限制性定语从句。选A。
考点:考查主语从句

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