单项选择题

A.E-mailB.E-commerceC.E-IearningD.E-communication（）hasb……

（）hasbecomeafactofmodemlife，withmillionsofpeoplenowshoppingon-line.

A.E-mail
B.E-commerce
C.E-Iearning
D.E-communication

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A.protocols
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A.computer-oriented
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A.test
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