单项选择题:
Every year a flood of farmers arrive in Shenzhen for money-making jobs they（）before leaving their hometowns.
A. promised B. were promised C. have promised D. have been promised
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答案：D
解析:本题考查从句的时态和语态，根据题意，句中的挣钱的工作应该是别人向农民承诺的，因此这里应该用被动语态，排除A和C。这个承诺对农民的影响一直持续到现在，因此应该用现在完成时。故选D。