题干
.
A volunteer is a person willing to help others, one who offers to do something without__________.
A volunteer is a person willing to help others, one who offers to do something without__________.
A：paying
B：paid
C：being paid
D：to pay
答案(点此获取答案解析）
C
，集合
和
的关系的韦恩（Venn）图如图所示，则阴影部分所示的集合的元素共有（ ）
