网友作文四： From: office Manager
To: all staff
Subject: upgarde of computer system
As our computer system need to be upgraded, we have arranged the contarctors to upgrade the them [1]on Wedesday. On that day all computers should be shutted down for a full day, so you need arrange some alternative work for that day.
名师修改意见： [1]第一: 不要重复使用前面已经用过的词;第二：指代错误，前面说的system 是单数，怎么到这里变成了them? 合成一句：as we have arranged the contractor to upgrade our computer system.
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