问题
选择题
They share with each other the information from the Internet．[ ]
A．downloading
B．downloaded
C．to download
D．having been downloaded
答案
答案：B
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They share with each other the information from the Internet．[ ]
A．downloading
B．downloaded
C．to download
D．having been downloaded
答案：B
与二次方案对应的一次方案为(80；3，4)。