宽带IP城域网必须是可管理和可扩展的电信运营网络。
正确
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is,are,was,were,willbe,aregoingtobe,have,has,hadThebeautiful________somethingthattheinnocent________notalwaysabletoappreciatefully.
They________extensiveandpossiblydangerousactualflighttraining.
WhichofthefollowingcountryisnotamemberofOECD?
Oneofourclientsis______themarket______Men’sShirts.
Themissingboyswerelastseen________neartheriver.