C.are sent
从 every year 可以看出句子要用一般时,send 与engineers是被动关系,是指工程师被送到非洲去,所以选c
A large number of engineers( )to Africa every years
A large number of engineers( )to Africa every years
A.have sent B.will send C.are sent D.were sent说原因
A.have sent B.will send C.are sent D.were sent说原因
英语人气：179 ℃时间：2020-03-29 21:42:11
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