Many websites have been to help people study foreign languages.
A. set off
B. set up
C. set down
D. set out
网友回答
A. set off
(答案→)B. set up
C. set down
D. set out
解析：考查词组：A. set off出发，动身，B. set up建立，C. set down记下，D. set out出发，动身，句意是：很多网站被建立来帮助人们学习外语。选B。