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

In order to keep a bigh level of safety, all the staff are required (wear) ______ protective clothes.

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问题 In order to keep a bigh level of safety, all the staff are required (wear) ______ protective clothes.
选项
答案to wear
解析 本题考查对动词require用法的掌握。动词require后要接动词不定式。本句意为“为了保持高水平的安全性，要求所有的员工都穿防护服装”。
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