The Internet has brought big changes in the way we work．A. aboutB. outC. backD. up

问题补充：

The Internet has brought big changes in the way we work．

A. about

B. out

C. back

D. up

答案：

(答案→)A. about

B. out

C. back

D. up

解析：bring about 引起，符合句意。