摘要： A large number of engineers to Africa by our government to help the people there every year. A. have sent B. will send C. are sent 答案:C
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A large number of engineers ___ to Africa by our government to help the people there every year.
[ ]
A. have sent
B. will send
C. are sent
D. was sent
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B. will send
C. are sent
D. was sent