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31. — It's no easy task to catch a ticket on a website that receives 1 billion clicks daily.
— I can't agree with you more. There ________ be errors for every single s
tep.
A. should B. must C. will D. can
.Evan哲 发表于 2012-12-20 22:58
我想选D...我其实觉得最好填COULD，表示每一步都 可能 存在错误
B会不会太肯定了点？每一步都有错误？
{:3_42:}
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