谁来帮我解释一下这道英语选择题
Manypeoplehaverealizedthatwewon'thaveanymorecleanwatertodrinkunlesssomething_____tofi...
Many people have realized that we won't have any more clean water to drink unless something _____ to fight against pollution.
A.was done B.will be done C.to be done D.is done
答案是D 为什么呢?解释详细一点!! 展开
A.was done B.will be done C.to be done D.is done
答案是D 为什么呢?解释详细一点!! 展开
6个回答
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询