Recently I bought a beautiful car, was reasonable.
A. of which price
B. the price of whose
C. the price of which
D. which price
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A. of which price
B. the price of whose
(答案→)C. the price of which
D. which price
解析：考查定语从句。句中先行词为a beautiful car，the price of which = whose price，故选C。