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

D

解析試題分析：考查情態(tài)動詞+完成式的用法：句意：一項調(diào)查表明40%的在交通事故中喪生的人如果戴好安全帶可能就能得救。用could have done表示“本來可能做卻沒有”，Should have done本應(yīng)該做而沒有，must have done一定做過…，need have done本需要做卻沒有做，都不符合句意，選D。
考點：考查情態(tài)動詞+完成式的用法

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