Some people say that the world is becoming smaller than before the Internet.A. onB. next

问题补充：

Some people say that the world is becoming smaller than before the Internet.

A. on

B. next to

C. because

D. because of

答案：

A. on

B. next to

C. because

(答案→)D. because of

解析：句意：有人说，世界因为互联网而变得越来越小。On在…上； next to紧接，紧邻；在…近旁； because因为，引导原因状语从句； because of因为，后跟名词或代词，所以选D。