Why the explosion occurred was the laboratory attendant had been careless.A. for B.because C. since D. that 题目和参考答案——青夏教育精英家教网—

题目内容

Why the explosion occurred was ____ the laboratory attendant had been careless.

A. for B.because C. since D. that

【解析】

试题分析：考查表语从句：句意：爆炸发生的原因可能是实验室管理员太粗心了。Why引导的是主语从句，was后面是表语从句，因为成分和意思都很完整，用that引导表语从句，for不能引导表语从句，because因为，since自从，选D。

考点：考查表语从句

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