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题目
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This building is both a secret and a mystery. No one shall be admitted into it ______ he can give the right password.
A.ifB.asC.sinceD.unless

答案
D
解析
考查连词。句意为这幢楼是一个秘密和迷。没有人可以被允许进入,除非他可以得到正确的密码。
核心考点
试题【This building is both a secret and a mystery. No one shall be admitted into it _】;主要考察你对连词等知识点的理解。[详细]
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