Many farmers arrive in Shengzhen for money-making jobs which ____before leaving their hometown.
空格部分是they have promised还是they have been promised
人气：405 ℃ 时间：2020-03-27 22:20:13
解答
选择：they have promised.
而they have been promised 若看做被动语态,没有这种用法；若将其看成是be+表语,promise也没有此种用法.
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