factories must stop ___________ the environment A polluting Bto pollute C pollute Dto polluting.选几?

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factoriesmuststop___________theenvironmentApollutingBtopolluteCpolluteDtopolluting.选几?factoriesmusts

factories must stop ___________ the environment A polluting Bto pollute C pollute Dto polluting.选几?
factories must stop ___________ the environment A polluting Bto pollute C pollute Dto polluting.
选几?

factories must stop ___________ the environment A polluting Bto pollute C pollute Dto polluting.选几?
选A stop doing 停止做某事

A~~~~~~~~~~