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第1题

The almost bare sheets in the file mocked the effort. A. She tried in vain to write the obituary. B. She made great e
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第2题

Cable Modem的传输方式分为对称式传输和（ ）两种
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第3题

Then the third grade note had opened the attack. A. Then the third grade teacher began to speak ill of him. B. Then t
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第4题

网络主机的IP地址由一个（ ）的二进制数字组成
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