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
Our teachers ask us ( ) (not litter) on the ground.We should ( )(keep) our classroom clean.
Our teachers ask us ( ) (not litter) on the ground.We should ( )(keep) our classroom clean.
英语人气：168 ℃时间：2019-11-21 05:09:11
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