______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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