The operation room in every hospital has...

The operation room in every hospital has to ______ bacteria of any kind.

A．keep free from

B．make it free from

C．be made free from

D．be kept free from

D 【解析】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。考点：考查固定词组和语态

考点分析：

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