问题补充:
Johnson bought a new car last week, and doubled that of the old one.
A. which price
B. the price of which
C. its price
D. the price of whose
答案:
A. which price
B. the price of which
(答案→)C. its price
D. the price of whose
解析:考查并列句.本句是由and连接的两个并列句,故不用引导词,下文特指上文汽车的价格,故用物主代词its,它的,选C.