The operation room in every hospital has to ______ bacteria of any kind. A．keep free from B．make it ...
2022-12-25 21:39:41 124次 2012-2013学年浙江省高二上学期期中考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The operation room in every hospital has to
______ bacteria of any kind.
|
A．keep free from
|
B．make it free from
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C．be made free from
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D．be kept free from
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