______ all the required papers, he didn’...

______ all the required papers, he didn’t answer the questions fluently in class.

A．Having not read

B．Not having read

C．Not read

D．Not to read

B 【解析】考查非谓语动词做原因状语用法。He与read构成主动关系，根据句意可知是完成时且表示主动，所以使用现在分词形式。非谓语动词的否定式是在前面直接加not,所以选择B。结合句意可知B正确。句意：因为没有读完所有要求的论文，他在课堂上不能流利地回答问题。

考点分析：

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