答案:If he hadn't been careless, he would have done better in the exam.你的原句是一个省略if的虚拟条件句,所以需要部分倒装。虚拟条件句的从句部分含有were, should 或 had时,可省略 if, 再把were,should 或 had 移动到从句的句首,实行倒装。所以此处只需要把倒装还原,加上if即可。
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