问题补充:
单选题Ifwehadtakensucheffectivemeasuresmuchearlier,thefiver____soseriouslynow.A.is not pollutedB.would not be pollutedC.had not been pollutedD.would not have been polluted
答案:
B
时间:2020-07-18 22:23:35
单选题Ifwehadtakensucheffectivemeasuresmuchearlier,thefiver____soseriouslynow.A.is not pollutedB.would not be pollutedC.had not been pollutedD.would not have been polluted
B