单选题：Mr. Eagle is uncertain about the future of txteagle because

题目分类：专四
题目类型：单选题
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题目内容：

Mr. Eagle is uncertain about the future of txteagle because __________． A． unexpected ways of using it emerge continuously
B． the contract-labour force is constantly increasing
C． there are more and more mobile-phone users
D． various companies are interested in the service

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请在第38处填上正确答案。

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