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

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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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