The pilot kept calm in the terrible storm, otherwise the accident ______.
A．couldn’t be prevented
B．mustn’t have prevented
C．wouldn’t have been prevented
D．shouldn’t prevent
C
根據(jù)句意“幸虧飛行員保持鎮(zhèn)靜，要不然這場(chǎng)事故是不會(huì)避免的”，對(duì)過(guò)去的推測(cè)。
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