问题
选择题
We must try our best to keep the factory _____ the waste water into the river. [ ]
A. from pouring
B. to pour
C. poured
D. pour
答案
答案：A
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We must try our best to keep the factory _____ the waste water into the river. [ ]
A. from pouring
B. to pour
C. poured
D. pour
答案：A