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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

解析試題分析:句意:眾所周知的是應(yīng)該采取有效的措施來處理過度開采資源的問題。分析句子成分可知,第二個is是謂語,前面的句子是主語從句,因為主語從句缺少主語,所以用what連接主語從句,It做的是形式主語,那么后面的is就要去掉,as引導(dǎo)的是非限制性定語從句,is就要改成逗號,which也是引導(dǎo)非限制性定語從句。選A。
考點:考查主語從句

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