Question

虚拟语气，请问本题为什么不选A？

A recent survey has demonstrated that a large number of victims during the COVID­19 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
【答案】 D
【解析】 句意：最近的一项调查显示如果戴了口罩在新冠疫情爆发期间，大量的受害者本可以得救。这是一个虚拟条件句，是对过去情况的假设，故选D。

Answer 1

A should have been saved (should have done 结构）意思是本应该做某事，而实际上未做到；
B must have been saved （must have done 结构）一定做过某事，是对过去发生事情的一种肯定猜测
C need have been saved (need have done 结构） 本需要做某事而实际上未做
D could have been saved (could have done ) 本可能做某事而实际上未做
D