Do not think that you are helping others who are not fortunate, but think of it as a/an _______.

A、exchange
B、bargain
C、trade
出自:行车设备维修施工管理规定

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块