Every year a flood of farmers arrive in Shenzhen for the money-making jobs they before leaving their hometowns.
A. promised
B. were promised
C. have promised
D. have been promised
网友回答
A. promised
B. were promised
C. have promised
(答案→)D. have been promised
解析：由时间状语before leaving their hometowns即可确定用现在完成时态，句意是每年有大量的农民工来深圳打工，在他们离家之前就已经被寄予希望。故选D。