some of the questions the man said good-bye to us.A. Leave;unansweredB. Leaving;unanswer

问题补充：

some of the questions ,the man said good-bye to us.

A. Leave;unanswered

B. Leaving;unanswered

C. Left;to be answered

D. Leaving;unanswering

答案：

A. Leave;unanswered

(答案→)B. Leaving;unanswered

C. Left;to be answered

D. Leaving;unanswering

解析：根据句子结构，第一个空应该使用现在分词作状语。再根据宾语the questions和宾补unanswered的逻辑关系判断，宾补应该使用过去分词形式表示被动。