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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1385

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
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Asurveyhasshownthat40%ofthosek