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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