He must be ill,｛｝he looks so pale.A.since B.because C.as D.for那个是正确答案,为什么?He must be ill,｛｝he looks so pale.A.since B.because C.as D.for那个是正确答案,为什么?

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Hemustbeill,｛｝helookssopale.A.sinceB.becauseC.asD.for那个是正确答案,为什么?Hemustbeill,｛｝helookssopale.A.since

He must be ill,｛｝he looks so pale.A.since B.because C.as D.for那个是正确答案,为什么?He must be ill,｛｝he looks so pale.A.since B.because C.as D.for那个是正确答案,为什么?
He must be ill,｛｝he looks so pale.A.since B.because C.as D.for那个是正确答案,为什么?
He must be ill,｛｝he looks so pale.
A.since B.because C.as D.for那个是正确答案,为什么?

He must be ill,｛｝he looks so pale.A.since B.because C.as D.for那个是正确答案,为什么?He must be ill,｛｝he looks so pale.A.since B.because C.as D.for那个是正确答案,为什么?
D
因为, for引导的是一个并列句,它后面的句子一般作为前面的解释；
because引导的是一个原因状语从句,它强调绝对的,所以why的句子,一定要用because回答.
原因状语从句一般由because, since, as, for引导?注意as,because,since和for的区别:
　　①如果原因是构成句子的最主要部分,一般用because.because引导的从句一般不放在句子的开头.例如:
　　I missed the train because I got up late.
　　注:对于以why开头的问句,一般只能用because引导的从句来回答.
　　②如果原因已为人们所知,或不如句子的其余部分重要,就用as或since、since比as稍微正式一些.as和since引导的从句一般放在句子的开头.例如:
　　As he was not well,I decided to go there without him.
　　Since this method doesn't work, let's try another.
　　③for表示所说的理由是一种补充说明,因此,for引导的从句可以放在括号里,而且for引导的从句一般不放在句子的开头.例如:
　　I decided to stop and have lunch, for I was feeling quite hungry.

He must be ill ,for he isn't here. He coughs _____-(terrible).He must be ill. The dentist thought he must be very.The dentist thought he must be very ill. He must be ill,___he doesn’t come to school. He must be ill,----------he is absent today.为何答案为For?because为何不能用? He isn't at school .I think he ( )be ill.can,shall,must,has to ,原因. he must ( )here.《be》 He must be happy! He must be ill,｛｝he looks so pale.A.since B.because C.as D.for那个是正确答案,为什么?He must be ill,｛｝he looks so pale.A.since B.because C.as D.for那个是正确答案,为什么? He is ______(terrible) ill.He must stay in bed. He must have been ill,___ he?如何变反意疑问句 He must have been ill,or he ______ to the party last night.Awould have beenB should be C would be D had to be He must have been ill,or he ( )to the party last nigjtA would have been B should be C would be D had to be He must be ill,__he looks so pale.A since Bbecause Cas Dfor 我选的是C ,为什么 He must have been ill,____?Yes ,otherwise he wouldnt be absent from the party yesterday.A.isn't he B.wasnt he C.can't he D.mustn't he He is ill.you must ______ him to hospital. He's been ill.He must be t___ to hospital at once .I like this city .I want to stay here for a______ two years. He isn't in the school ,I think he ___ be ill .A.need B.shall C.must D.havt to ,为什么?