He must be ill,____________he looks so pale.A.since B.because C.as D.fo
问题描述：
He must be ill,____________he looks so pale.A.since B.because C.as D.fo
He must be ill,____________he looks so pale.
A.since B.because C.as D.for
为什么这里用for?什么情况下可以用for?
答
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