Onceenvironmentaldamage_______,ittakesmanyyearsforthesystemtoreca、hasdoneb、istodoc、doesd、isdone
2022-04-20 53次 反馈错误 加入收藏 正确率 : 100%
题目内容：
Once environmental damage _______,it takes many years for the system to rec
a、has done
b、is to do
c、 does
d、is done
优质解答
D
本题链接：
