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Unit121.besupposedtodo.应该如：Wearesupposedtostopsmoking.我们应该停止吸烟。知识拓展表示应该的词有：should,oughtto,besupposedto2.shakehands握手shake本意是“摇动、震动”3.Youshouldhaveaskedwhatyouweresupposedtowear.你本应该问清楚怎...