Many experts hold the view ______ protection awareness is ______ the key to better environment lies.A.that; whereB.which; in whichC.which; whereD.that; in which
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A解析考查名词性从句中的同位语从句和表语从句。句意“许多专家认为更好的环境的关键在于（人们的）环保意识。”view“观点”，that引导同位语从句，对view进行解释说明；is后是一个表语从句，此处指的是抽象的地点，即key“关键”，用where引导表语从句；lie in“在于......”。故选A。