问题补充:
We are having a math lesson now, you must stop music.
A. listen
B. to listen
C. listening to
D. for listening
答案:
A. listen
B. to listen
(答案→)C. listening to
D. for listening
解析:根据前文的内容We are having a math lesson now,可知说明应该stop doing sth,为停止做某事,故选C