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
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