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第1题

在OSI参考模型中，数据链路层的上一层是（） A.网络层 B.传输层 C.会话层 D.应用层
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第2题

The president said that it.s the worst earthquake ever to hit the country, and that he ________ the world for help, aski
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第3题

The couple _______ never to work at the same time, so that one of them was always on full-time parenting duty, and their
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第4题

He was determined not to sour a perfectly good day with the memory of one jealous classmate trying to _______ a fool ___
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