The result of the experiment was very good,___ we hadn't expected.(A) when (B) that (C) which (D) whatwhy?

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The result of the experiment was very good,___ we hadn't expected.(A) when (B) that (C) which (D) whatwhy?
The result of the experiment was very good,___ we hadn't expected.
(A) when (B) that (C) which (D) what
why?

The result of the experiment was very good,___ we hadn't expected.(A) when (B) that (C) which (D) whatwhy?
此句子为 定语从句 which 在此指代The result of the experiment was very good 这件事
定语从句中 ,后边不用that.
而且 不用what 来引导定语从句
定从中 when 做时间状语,而本题从句中缺少的是动词expect 的宾语,所以要用WHAT