题目内容
（请给出正确答案）
[主观题]
Linda was _____te experiment a month ago,but she changed her mind at the last minute.
A. to start B.to have started C.to be starting D.to have been starting
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A．电信增值业务通过CN2网络承载
B．电路域移动软交换设备通过CN2网络承载
C．VPDN业务通过163网或者CN2网络来承载
D．分组域的国际漫游业务通过163网络来承载
