Every year a flood of farmers arrive in Shenzhen for the money­making jobs they befor

问题补充：

Every year a flood of farmers arrive in Shenzhen for the money­making jobs they before 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：

句意为：每年大量农民工涌入深圳，去寻找他们离乡前别人给他们许诺的挣钱的工作。此处农民工是“被许诺工作”，需用被动语态，故排除A和C两项；B项仅表一般过去时的被动；D项表示“已经被许诺”，故选D。