comic快楽天百度云:高手请进！

来源：百度文库 编辑：中科新闻网 时间：2024/05/11 16:11:56
___D___a satisfactory answer, so he had to write to them again.
A.As he hadn't received B.Not having received
C.Having not received D.He hadn't received
Why?
我的答案是正确答案!

C，分词短语作原因状语．

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