Since Shanghai won the right to host the World Expo over half a million people have volun

问题补充：

Since Shanghai won the right to host the World Expo, over half a million people have volunteered to in all the Shanghai Expo projects .

A. assist

B. apply

C. supply

D. provide

答案：

(答案→)A. assist

B. apply

C. supply

D. provide

解析：词义辨析。 A. assist帮助；参加 B. apply申请 C. 供给 D. 提供；规定。句意：自从上海赢得举办世博会的权利以来，超过一百万人义务参加了所有上海世博会的工程。故选A。