Question

A survey has shown that 40% of those killed in traffic accidents _____ if they had been wearing seat belts.

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

Answer 1

D

试题分析：考查情态动词+完成式的用法：句意：一项调查表明40%的在交通事故中丧生的人如果戴好安全带可能就能得救。用could have done表示“本来可能做却没有”，Should have done本应该做而没有，must have done一定做过…，need have done本需要做却没有做，都不符合句意，选D。