Every year a flood of farmers arrive in Shenzhen for the money-making jobs theybefore leav

问题补充：

Every year a flood of farmers arrive in Shenzhen for the money-making jobs theybefore leaving their hometowns.

A. promised

B. were promised

C. have promised

D. have been promised

答案：

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。