2. 外语
  3. In order to keep a high level of safety, all the staff are required (wear)______protective clothes.

In order to keep a high level of safety, all the staff are required (wear)______protective clothes.

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问题 In order to keep a high level of safety, all the staff are required (wear)______protective clothes.
选项
答案to wear
解析 本题考查动词require的用法，其后一般接动词不定式to do结构，其使用被动语态时后面同样需要接动词不定式，因此空格处应该填入to wear。
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本试题收录于： 大学英语三级B级题库大学英语三级分类
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