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
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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