During the flood many students volunteered ________ through the weekend, giving out food and water for the victims.
A．workingB．to work
C．to have workedD．having worked
B
B考察非謂語動(dòng)詞，句義：在洪水期間，很多學(xué)生自愿利用周末的時(shí)間為災(zāi)民發(fā)放食物和水。Volunteer to do sth自愿做某事。符合語境。故B正確。
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