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填空 In bigger post office,this work __________________ (do) b

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填空 In bigger post office,this work __________________ (do) by machines.After that,the letters _
In bigger post office,this work __________________ (do) by machines.After that,the letters ___________________ (put) into bags and ________________ (give) to other postmen for delivering to our homes.
不牵扯过去的时态,应用一般现在时."工作被机器做",主语work 是不可数名词,所以应用is done."信被放进袋子里" 主语the letters 是复数,应用are put .信被给到邮递员那里,也是被动语态,本应用 are given ,不过 该句是由and 连接的并列句,因为前后主语一致,故省掉后面谓语的系动词 are 所以最后一空应为 given.