问题补充:
The Internet has become increasingly popular, us to see as well as to hear all kinds of programmes.
A. to allow
B. allowing
C. allowed
D. having allowed
答案:
A. to allow
(答案→)B. allowing
C. allowed
D. having allowed
解析:考查非谓语动词。Internet与allow是主谓关系,使用现在分词表示伴随状况。句意:互联网正在逐渐流行起来,(它)允许我们边看边听各种各样的节目。故选B。