When I try to find _______ that prevents so many people from taking part in the program,it seems to me that there are two main causes.A.why it doesB.what it doesC.what it isD.why it is
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C解析find后为一个宾语从句，而且这个从句为强调结构。全句的意思是“当我想努力找出阻止许多人参加这一节目是什么原因时，依我看似乎有两个理由”。