Question

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

Answer 1

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。