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____ the computer competition quite well, he won the first prize.

A. Preparing
B. Having prepared
C. To prepare
D. Prepared
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科目：高中英語 來源：0127 期末題 題型：單選題

____ the computer competition quite well, he won the first prize.
[     ]
A. Preparing
B. Having prepared
C. To prepare
D. Prepared

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