---Youmustnot______litteronthefloor.---Sorry.Iwon'tdoitagain.A.drop

发布时间:2020-08-06 20:27:09

---You must not ______ litter on the floor.---Sorry. I won't do it again.A.droppingB.dropC.droppedD.to drop

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B解析情态动词后用动词原形。
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