He can't have gone out,_____the light is still on.

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He can't have gone out,_____the light is still on.
A because B since C as D for
为什么选D,不选其他三项啊,他们的区别是什么?

关于 for：是并列连词(其余三者为从属连词),它有时可表示因果关系(通常要放在主句之后,且可与 because 换用)；有时不表示因果关系,而是对前面分句内容的解释或推断(也要放在主句之后,但不能与because 换用).
关于 since 与 as：
两者所表示的原因都是人们已知的,即对已知事实提供理由,而不是表示直接原因.since 比 as 语气稍强,且比 as 略为正式,它们引导的从句通常放在主句之前,有时也放在主句之后：
As you weren’t there,I left a message.由于你不在那儿,我留了个口信.
Since you are wrong,you should apologize.你既然错了,就应该道歉.

He can't have gone out,___the light is still on 几道英语题目1.He can't have gone out,---the light is still on.---D 英语翻译He was punished.he _____the red light.a.couldn't have ju The light is out in her room.she to bed A.must have gone B.h Look,the light is still on in his study.he（）at moment --I can’t understand why our boss is late. --He _____the ear 请问一下1.The light is out.He ____ __ be in the classroom.A.can’ John still can't work out the problem __I have helped him se with all the work on hand ,he couldn't have gone to the cine He can't stand _____ light music. _____the children have fun,parents can take dance lessons on he is gone and you can go on with your story的同义句