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  3. ______the explosion occurred was that the laboratory attendant had been careless.

______the explosion occurred was that the laboratory attendant had been careless.

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问题 ______the explosion occurred was that the laboratory attendant had been careless.
选项 A、That
B、What
C、Why
D、How
答案C
解析 why引导的从句作主语，虽然that／how都可以引导从句作主语，但本题的表语从句表明了原因，因此why为正确答案。
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考研英语一

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