I have bought such a watch was advertised on TV. A. that B. which C. asD. it

问题补充：

I have bought such a watch was advertised on TV.

A. that

B. which

C. as

D. it

答案：

A. that

B. which

(答案→)C. as

D. it

解析：当先行词被such修饰时,引导定语从句的关系代词要用as. As在本从句中作主语.