The scientist has made another discovery, ________ I believe is of great importance.A.thatB./C.whichD.why
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C解析解题思路：这类句子主要利用插入语或状语的添加来增加试题的难度．常见的插入语有：I think (suppose，expect，believe，imagine) ，in my opinion，to tell you the truth等．做这类题目时，最佳的办法是先删去插入语或状语，这样句子的主干部分就一目了然了．