题目内容
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
A
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题目内容
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
A