问题
单项选择题
( )requires signing up with an ISP, which serves as a pipeline to the Internet.
A．Getting connected to the Internet
B．Visiting the Internet
C．On line
D．Down line
答案
参考答案：A
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( )requires signing up with an ISP, which serves as a pipeline to the Internet.
A．Getting connected to the Internet
B．Visiting the Internet
C．On line
D．Down line
参考答案：A