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
参考答案:【答案仅供学习,请勿对照自行用药等】
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