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The delay in diagnosis often leads to wo...

The delay in diagnosis often leads to worse health issues that _______ potentially preventable if they had been given the access in the country where they were working.

A. could have been    B. should have been    C. must have been    D. need have been

 

A 【解析】 考查情态动词+have done。A. could have been本可以;B. should have been本应该;C. must have been过去一定;D. need have been本来有必要。句意:延迟诊断往往会导致更严重的健康问题,如果他们能在工作的国家得到治疗,这些问题本是可以预防的。根据句意可知此处表示“本来可以”,故A项正确。  
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