. --- What a beautiful hat ! How much did it you ?
--- It’s . I’m very lucky to be the 1000th customer of the shopping center.
A. charge; free of charge
B. charge; free of the charge
C. cost; free of charge
D. cost; free of the charge
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解析：考查：charge 要价，其宾语是金钱，如：charge five dollars for the book；free of the charge免费的，根据题意所以选C。