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The result of the experiment was very good,___ we hadn't exp

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The result of the experiment was very good,___ we hadn't expected.
(A) when
(B) that
(C) which
(D) what
The result of the experiment was very good,___ we hadn't exp
选C,非限定定语从句(非限定性定语从句的前面往往有逗号隔开),非限定性定语从句常用关系代词which来指代事物.“实验的结果非常好,是我们都没预料到的”,这里which就代指“实验结果很好”这一事.所以用which.