(2013·浙江金华二模)A survey has shown that 40% of those killed in traffic accidents if they had

网友回答

A. should have been saved
B. must have been saved
C. need have been saved
(答案→)D. could have been saved
解析：选D　句意：一项调查表明，在交通事故中丧生的人，如果当时一直系着安全带，那么他们中40%的人有可能不会丧命。根据“if they had been wearing”可知，此处是对过去情况的虚拟，主句谓语的形式应为“would/could/might/should＋have done”，排除B、C两项，根据句意应表示“可能”而不是“应该”，故选D。