--______ we clean the classroom at once? --No, you _____. You____ clean it after school. A.M..
--______wecleantheclassroomatonce?--No,you_____.You____cleanitafterschool.A.Must,need...
--______ we clean the classroom at once? --No, you _____. You____ clean it after school. A.Must, needn’t, may B.Must, mustn’t, can C.Shall, can’t, must D.Need, mustn’t, may
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