(2013·浙江金華二模)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
D
選D　句意：一項調(diào)查表明，在交通事故中喪生的人，如果當(dāng)時一直系著安全帶，那么他們中40%的人有可能不會喪命。根據(jù)“if they had been wearing”可知，此處是對過去情況的虛擬，主句謂語的形式應(yīng)為“would/could/might/should＋have done”，排除B、C兩項，根據(jù)句意應(yīng)表示“可能”而不是“應(yīng)該”，故選D。
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