问题补充:
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
答案:
A. Having not read
(答案→)B. Not having read
C. Not read
D. Not to read
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。