问题
选择题
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
答案：C
考查时态，根据题中的时间状语Up to now，应用现在完成时态，large quantities of+名词做主语时，谓语动词都用复数，故选C。