lose less litter to keep the environment _______A.cleanly B.polluted C.clean D.polluting

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loselesslittertokeeptheenvironment_______A.cleanlyB.pollutedC.cleanD.pollutingloselesslittertokeepth

lose less litter to keep the environment _______A.cleanly B.polluted C.clean D.polluting
lose less litter to keep the environment _______
A.cleanly B.polluted C.clean D.polluting

lose less litter to keep the environment _______A.cleanly B.polluted C.clean D.polluting
keep sth.+adj.
表示让...保持...
这里应选保持环境干净
选C

C