When a post office handles large quantities of mail daily,it is essential that mechanical methods are used to maintain production and ensure prompt delivery of the mails答案说are used 要改成 be used 为什么?

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Whenapostofficehandleslargequantitiesofmaildaily,itisessentialthatmechanicalmethodsareusedtomaintain

When a post office handles large quantities of mail daily,it is essential that mechanical methods are used to maintain production and ensure prompt delivery of the mails答案说are used 要改成 be used 为什么?
When a post office handles large quantities of mail daily,it is
essential that mechanical methods are used to maintain
production and ensure prompt delivery of the mails
答案说are used 要改成 be used
为什么?

When a post office handles large quantities of mail daily,it is essential that mechanical methods are used to maintain production and ensure prompt delivery of the mails答案说are used 要改成 be used 为什么?
虚拟语气.should be used,省略了should

虚拟语气should be used,
should 省略了

虚拟语气....should be used,省略了should
回答者: milklittle - 秀才 三级 9-13 16:26
虚拟语气should be used,
should 省略了
回答者: fcpcz - 高级经理 六级 9-13 16:31