Why the explosion occurred was______the laboratory attendants had been careless.

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问题 Why the explosion occurred was______the laboratory attendants had been careless.

选项 A、owing to
B、because
C、since
D、that

答案D

解析宾语从句。根据句子结构，空处引导宾语从句，连接主从句，在从句中不充当成分(从句完整)，故选择that。

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专业英语四级

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