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

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

 

D

【解析】

試題分析：考查表語從句：句意：爆炸發(fā)生的原因可能是實(shí)驗(yàn)室管理員太粗心了。Why引導(dǎo)的是主語從句，was后面是表語從句，因?yàn)槌煞趾鸵馑级己芡暾�，用that引導(dǎo)表語從句，for不能引導(dǎo)表語從句，because因?yàn)�，since自從，選D。

考點(diǎn)：考查表語從句

 

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