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?

题目

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?

答案

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...