问题补充:
—What’s wrong with your ipad? The soundis not clear.
—Yes. It has been broken for some time.
A. come out
B. coming out
C. to come out
D. came out
答案:
A. come out
(答案→)B. coming out
C. to come out
D. came out
解析:本题考查非谓语动词。所修饰名词The sound与come out之间的关系为主动关系,故用现在分词,选B。