英语时态跟语态Every year a flood of farmers arrive in Shenzhen for the money-making jobs they ____ before leaving their hometown.A.promised .B.were promised C.have promised D.have been promisedD为什么对了

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英语时态跟语态
Every year a flood of farmers arrive in Shenzhen for the money-making jobs they ____ before leaving their hometown.
A.promised .B.were promised C.have promised D.have been promised
D为什么对了

嗯嗯~这么说吧,如果没有后面的before leaving their hometown,那就选B.之所以选D就是因为这里现在完成时强调动作的完成性,即“已经”承诺的.before出现就有一个时间的先后存在,所以动作相应地也会有先后,明白了吧.很多类似的题如果出现类似B、D模棱两可时一般都选带完成时的!希望对你有帮助!