-----When can I come for the photos?I need them tomorrow afternoon.------They ______ be ready by 12:00A.can B.should为什么不用can呢?

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-----WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.------They______bereadyby12:00A.canB.should

-----When can I come for the photos?I need them tomorrow afternoon.------They ______ be ready by 12:00A.can B.should为什么不用can呢?
-----When can I come for the photos?I need them tomorrow afternoon.
------They ______ be ready by 12:00
A.can B.should
为什么不用can呢?

-----When can I come for the photos?I need them tomorrow afternoon.------They ______ be ready by 12:00A.can B.should为什么不用can呢?
should 可表说话者根据一定的经验或情况作出的较为肯定的推测.上下文中第二个人的回答是基于自己的工作经验或者是店里的操作流程估算出的时间,是他的较为肯定的推测.
can用于肯定句中指客观的事实,不是个人猜测出来的.如:
In this area, it can be very cold. (指天气在这个地区就是如此)