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高二英语选择要解析_______a bit more careful in the exam ,many of such

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高二英语选择要解析
_______a bit more careful in the exam ,many of such mistakes could have been avoided.
A.should you are B.if you were
C.had you been D.if you have been
c;这个题是虚拟语气的考查
首先你要明白虚拟语气,这句话是说:如果你在考试中再细心点的话,很多错误都可以避免.
所以他是对过去的虚拟,实际情况是 考试已经过去,问题也出现了.
If 从句应该是had + done 所以后面 主句有could have done
当前面if省略时,把had 前提.当然如果是对现在或将来虚拟时,就要把were ,should
等提前
Were I you ,I would make full use of the time.
虚拟语气很简单,记住时态表格是关键.