问题
选择题
During the flood many students volunteered ________ through the weekend, giving out food and water for the victims.
A．working
B．to work
C．to have worked
D．having worked
答案
答案：B
B考察非谓语动词，句义：在洪水期间，很多学生自愿利用周末的时间为灾民发放食物和水。Volunteer to do sth自愿做某事。符合语境。故B正确。