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A
for
B
because
C
since
D
that
正确答案 :D
解析
本体考查英语语法——表语从句。
句意:这次爆炸是实验室的工作人员粗心导致的。 分析句子成分,主干的动词为was,was之前为主语,was之后为表语;表语句子结构完整,句意完整,引导表语从句that不可省略。故选D。
A、B、C项均为干扰选项,故排除。
故本题答案为D。
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