问题描述：
I think _____ of the materials I listened to at the begining of the exam ______ easy.
A.two thirds;is B.second three ; are C.two thirds ;are D.two third;are要原因详细谢谢
A.two thirds;is B.second three ; are C.two thirds ;are D.two third;are要原因详细谢谢
问题解答：
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