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He made a quick _____ from an unfriendly to a friendly manner when he saw that we could help him.

A. decision
B. preparation
C. switch
D. difference
C
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科目：高中英語 來源：0115 月考題 題型：單選題

He made a quick _____ from an unfriendly to a friendly manner when he saw that we could help him.
[     ]
A. decision
B. preparation
C. switch
D. difference

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