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单选题
Why the explosion occurred was _____ the laboratory attendant had been careless.
A

for

B

because

C

since

D

that


参考答案

参考解析
解析:
句意:发生爆炸的原因是做实验的人太粗心。that引导的是表语从句,解释说明主语的内容,前面则是由why引导的主语从句。
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