We must do something to factories waste water into the river before it is cleaned. A. st

发布时间：2020-08-15 02:24:40

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

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(答案→)A. stop; pouring .
B. prevent; to pour
C. keep; pouring
D. stop; to pour
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