We should like to inquire if you _______ expanding your business

We should like to inquire if you _______ expanding your business to this area.
A、be interested in
B、are interested to
C、are interested of
D、are interested in
【正确答案】：D
【题目解析】：be interested in对......有兴趣。句意：我们想知道贵公司是否有兴趣在这一地区扩大业务。