Ourteachersaskus()(notlitter)ontheground.Weshould()(keep)ourclassroomclean.
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题目内容：
Our teachers ask us ( ) (not litter) on the ground.We should ( )(keep) our classroom clean.
优质解答
not to litter
keep
ask sb.no to do sth.叫某人别做某事
should do sth.应该做某事
本题链接：
