问题标题:
________isknowntoallisthateffectivemeasuresshouldbetakentodealwiththeproblemoftheover­exploitationofourresources.A.WhatB.ItC.AsD.Which
问题描述:

________isknowntoallisthateffectivemeasuresshouldbetakentodealwiththeproblemoftheover­exploitationofourresources.

A.WhatB.It
C.AsD.Which

廖勇毅回答:
  A选A 考查主语从句。分析句子结构可知,空处引导主语从句,且在从句中作主语,所以用what引导。注意区分以下结构:Asisknowntoall,effectivemeasuresshouldbe...,其中As引导非限制性定语从...
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