—Excuse me what can I do for you?—Yes. I'd like to place advertisement for used car in

问题补充：

—Excuse me, what can I do for you?

—Yes. Id like to place advertisement for used car in your paper.

A. the; a

B. an; /

C. an; a

D. /; the

答案：

A. the; a

B. an; /

(答案→)C. an; a

D. /; the

解析：考察冠词。第一空表示泛指一则广告；第二空是一类事物的表达法，表示一类事物有三种表达法：a/an+单数名词；the+单数名词；复数形式；结合句意可知C正确。句意：我想再你们的报纸上登一则二手车的广告。