快速锁定考试重点
搜题找答案更直观
专家精准答案解析
哪里不会就练哪里
量身定制优质试卷
[单选题]
The drinking water has became (contaminated) with lead.
A. polluted
B. treated
C. tested
D. corrupted
免验证、免广告、无限看题
考场题库丰富、科目种类广
答案准确率高、试题搜索快