【题目】Up to now, large quantities of food________to Africa to save the starving people.
A.is sent
B.has been sent
C.have been sent
D.are sent

【答案】C
【解析】考查主谓一致。句意：到目前为止，已有大量的粮食被送往非洲以拯救饥民。upto now通常与现在完成时连用；“largequantities of＋名词”作主语时，谓语动词往往用复数形式。