In order to keep a bigh level of safety, all the staff are required (wear) _____

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

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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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