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A recent survey has demonstrated that a ...

A recent survey has demonstrated that a large number of victims during the COVID-19 Outbreak______if they had worn masks.

A.should have been saved

B.must have been saved

C.need have been saved

D.could have been saved

 

D 【解析】 考查情态动词+have done。句意:最近的一项调查表明如果他们在新冠肺炎爆发时期戴了口罩,很多受害者本来可以被救。由句意可知,此处指如果带了口罩,一些人本来可以被救,could have done,意为“过去本可以做却未做”。故选D项。  
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