The Internet is always open and has nearly everything ________. 互联网一直是开放的，上面卖什么东西的都有。
A.for sale B.in business C.on duty D.for free正确答案A
The Internet is always open and has nearly everything ________. 互联网一直是开放的，上面卖什么东西的都有。
A.for sale B.in business C.on duty D.for free正确答案A
