There is no that phones play an important role in the modern life.A.question B. doubt C.

问题补充：

There is no that phones play an important role in the modern life.

A.question B. doubt C. problem

答案：

解析：毫无疑问，在现代生活中电话扮演了一个重要角色。no problem没问题，别人请求帮助时的答语。no doubt 毫无疑问，后面经常加从句。故选B