We must do something to _____ factories _____waste water into the river before it is cleaned.
A. stop; pouring . B. prevent; to pour C. keep; pouring D. stop; to pour
在线课程A
编辑:chaxungu时间:2026-05-02 04:42:54分类:高中生物题库
We must do something to _____ factories _____waste water into the river before it is cleaned.
A. stop; pouring . B. prevent; to pour C. keep; pouring D. stop; to pour
在线课程A