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

题干

(2013·浙江金华二模)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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