单选题Large quantities of water

单选题 Large quantities of water, as well as some other timely help including a medical team ___since the serious drought hit Yunnan Province.A.has offeredB.had been offeredC.have been offeredD.is offered

C解析考查时态语态和主谓一致。当主语后面接由as well as, as much as, accompanied by, including, in addition to, more than, no less than, rather than, together with等引导的词组时，其谓语动词的形式要依主语的单复数而定，而quantities of无论修饰可数名词还是不可数名词，谓语动词都用复数，故排除A和D，又因为时间状语是shince引导的，故主句应用现在完成时。故

就是这个解释