问题补充:
She showed me a red silk dress online, which cost her only 10 dollars.
A. to be bought
B. being bought
C. bought
D. having bought
答案:
A. to be bought
B. being bought
(答案→)C. bought
D. having bought
解析:考查非谓语动词。过去分词bought作定语,修饰red silk dress,表被动关系,选C。