— 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．should B．must
C．will D．can

D

解析此處表示“有時會”這個意思，用can可以表示理論上會發(fā)生的事，用于肯定句中。此句意為：每一步都可能存在錯誤。should應該，竟然；must肯定，必須；will將要，均不符合句意。

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