Every year a flood of farmers arrive in Shenzhen for the money-making jobs they before lea

问题补充：

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

答案：

A. promised

B. were promised

C. have promised

(答案→)D. have been promised

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