Every year a flood of farmers arrive in Shenzhen for the money-making jobs they ________ before leaving their hometowns.
问题描述：
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
请帮忙分析一下句子成分,“before leaving their hometowns”是省略句吗?是怎么省略的.
答
B
农民工是被许诺的,是被动语态,动作在过去发生,用过去式,并且,before leaving their hometowns里的before是介系词,表示“在……之前”,介系词后面用的是动名词,希望我能帮助你解疑释惑.