来自方湘怡的问题
【英语翻译29．Ifwehadtakensucheffectivemeasuresmuchearlier,theriversoseriouslynow.A．isnotpollutedB．wouldnotbepollutedC．hadnotbeenpollutedD．wouldnothavebeenpolluted】
英语翻译
29．Ifwehadtakensucheffectivemeasuresmuchearlier,theriversoseriouslynow.
A．isnotpollutedB．wouldnotbepolluted
C．hadnotbeenpollutedD．wouldnothavebeenpolluted
