What do you think of the reason he mentioned at the meeting winning this petition?
A. why; why
B. that; of
C. which; why
D. \; for
网友回答
A. why; why
B. that; of
C. which; why
(答案→)D. \; for
解析：通过分析句子结构，可知这个句子中包含一个定语从句，且关系词在定语从句中作宾语，先行词指物，故用that或which，也可省略。第二个空，表示“为了赢得比赛”，故用介词for。