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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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 |