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The operation room in every hospital has to ______ bacteria of any kind.
A.keep free fromB.make it free from C.be made free fromD.be kept free from
D

试题分析:考查固定词组和语态。固定词组free from免受…的伤害;句意:每家医院的手术室要被设成不受任何细菌的影响。根据句意说明使用被动语态。
点评:固定词组free from免受…的伤害。句子的语态要从上下文的句意出发,同时注意不同的时态的被动语态的形式上的区别。
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