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It’s necessary ________ masks(口罩)in publ...

It’s necessary ________ masks(口罩)in public places during the COVID-19 period.

A.for us to wear B.for us wearing C.of us wearing D.of us to wear

 

A 【解析】 句意:在COVID-19期间,我们有必要在公共场所戴口罩。 考查固定句式。根据语境可知,对我们来说在公共场所戴口罩是有必要的,本句考查it作形式主语,动词不定式作逻辑主语的固定句式,即It+be动词+形容词+of/for sb to do sth,故排除B、C两项。当形容词表人的性格品质时,用介词of;当形容词仅描述事物,不对行为者的品格进行评价,用介词for。本句中形容词necessary仅表示“戴口罩这件事有必要”,不是描述行为者的性格特点,故应用介词for,即for us to wear。故选A。  
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