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______ for the efforts of medical staff,...

______ for the efforts of medical staff, the spread of the novel coronavirus would not be controlled, which astonishes the whole world.

A.Were not it B.Were it not C.Had not it been D.If it were

 

B 【解析】 考查虚拟语气的倒装。句意:要不是医护人员的努力,新型冠状病毒的传播速度不会被控制住,这一点让全世界都很惊叹。此处是省略if的虚拟语气,结合主句would not be controlled可知与现在事实相反,be动词were放在主语it前面,故选B。
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