—I’m sure Andrew will win the first prize in the final.
—I think so. He _________ for it for months.
| A．was preparing | B．is preparing |
| C．has been preparing | D．had been preparing |
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—I’m sure Andrew will win the first prize in the final.
—I think so. He _________ for it for months.
| A．was preparing | B．is preparing |
| C．has been preparing | D．had been preparing |
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