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— 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 step.
A.shouldB.must
C.willD.can
D

此处表示“有时会”这个意思,用can可以表示理论上会发生的事,用于肯定句中。此句意为:每一步都可能存在错误。should应该,竟然;must肯定,必须;will将要,均不符合句意。
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