________I known what was going to happen, I would never have left her alone.
Had　
考查虛擬語(yǔ)氣。由后句可知，這是對(duì)過(guò)去事情的假設(shè)，所以從句應(yīng)該用過(guò)去完成時(shí)省略了if，同時(shí)把had提前。
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