摘要： There are several chemical factories waste water into the river. A. pouring B. pour C. to pour D. poured
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There are several chemical factories _______ waste water into the river.
[ ]
A. pouring
B. pour
C. to pour
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B. pour
C. to pour
There are several chemical factories ______ waste water into the river.
A. pours B. pour C. pouring
There are several chemical factories ______ waste water into the river.
A. pours B. pour C. pouring
A. pours B. pour C. pouring