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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

試題分析：考查固定詞組和語態(tài)。固定詞組free from免受…的傷害；句意：每家醫(yī)院的手術(shù)室要被設(shè)成不受任何細(xì)菌的影響。根據(jù)句意說明使用被動(dòng)語態(tài)。
點(diǎn)評(píng)：固定詞組free from免受…的傷害。句子的語態(tài)要從上下文的句意出發(fā)，同時(shí)注意不同的時(shí)態(tài)的被動(dòng)語態(tài)的形式上的區(qū)別。
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