疑问句
中文翻译：谁曾经
同义词：
['Who could have done?', 'Who might have done?']
例句：
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1. I wonder who could have predicted the market crash.
我想知道是谁预测了市场的崩溃。
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2. He wondered who could have survived that storm.
他想知道是谁在那场风暴中幸存下来。
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3.She wondered who could have been responsible for the accident.
她想知道是谁对那次事故负有责任。