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

AWhat BIt

CAs DWhich

 

A

【解析】A 考查主語(yǔ)從句。分析句子結(jié)構(gòu)可知,空處引導(dǎo)主語(yǔ)從句,且在從句中作主語(yǔ),所以用what引導(dǎo)。注意區(qū)分以下結(jié)構(gòu):As is known to all, effective measures should be ...,其中As引導(dǎo)非限制性定語(yǔ)從句;It is known to all that effective measures should be ...,其中It為形式主語(yǔ),真正的主語(yǔ)是that引導(dǎo)的主語(yǔ)從句。

 

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