For example,some people waste a lot by _______ dirty water away and throwing rubbishrubbish into rivers and lakesA.pourB.poursC.pouringD.to pour

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For example,some people waste a lot by _______ dirty water away and throwing rubbishrubbish into rivers and lakesA.pourB.poursC.pouringD.to pour
For example,some people waste a lot by _______ dirty water away and throwing rubbish
rubbish into rivers and lakes
A.pour
B.pours
C.pouring
D.to pour

For example,some people waste a lot by _______ dirty water away and throwing rubbishrubbish into rivers and lakesA.pourB.poursC.pouringD.to pour
选C,pouring away 和throwing是并列的两个动作,by这里做介词,后接动名词

选C by doing `````

选C.pouring

选C,by在这里做介词,后接动名词,pouring away 和throwing是并列的两个动作。