— 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 |
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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．should | B．must |
| C．will | D．can |
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