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第1题

We have come to a critical moment. You must take immediate ______. A.action B.activity C.act D.doings
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第2题

With _____, the adventurers succeeded in making a fire to warm themselves. A.they could find B.which they could find
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第3题

A sudden idea _____ to him that he might try the new method. A.occurred B.took place C.happened D.took part
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第4题

在密钥管理系统中最核心、最重要的部分是（ ） A.工作密钥 B.数据加密密钥 C.密钥加密密钥 D.主密钥
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