if虚拟条件倒装的问题 关于if条件虚拟语气 倒装
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\uff081\uff09Were they here now, they could help us.=If they were here now, they could help us.
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\uff082\uff09Had you come earlier, you would have met him.=If you had come earlier, you would have met him.
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\uff083\uff09If I were you, I would go to look for him.
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\uff084\uff09If he were here, everything would be all right.
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1\u3001\u5bf9\u73b0\u5728\u60c5\u51b5\u7684\u865a\u62df
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If I were you,I would choose to work in a small town.
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2\u3001\u5bf9\u8fc7\u53bb\u60c5\u51b5\u7684\u865a\u62df
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If it had not been for your help yesterday,I could not have caught the bus.
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If things were to be twice\uff0call would be wise.
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原句应该为:
If he had studied harder,he would have been able to pass the exam.
而其实if的倒装也是关于If的省略:在书面语中，连接词if常被省略，省略if后，从句的主谓结构要部分倒装，即把were，should，had移到句首.
举个例子:
If he should come tomorow,I would tell hin about it. 省略If 后，应为:
Should he come tomorrow,I would tell hin about it.
也可以将主句和从句两个互倒，即 把逗号前面和后面的句子互倒:
I would tell hin about it,should he come tomorrow.
再用你的问题中的句子来说，省略If 可为
Had hestudied harder,he would have been able to pass the exam.
答得好像有点多了，而D选项应用于与现在事实相反，所以不能选。希望有帮助哦
这道题正解C。
主句用的是he would have been able to pass the exam ， would have done 表示与过去事实相反的虚拟语气， 翻译为他当时就通过考试了。 那么更努力学习的话， 那也应该是过去努力学习，而不是 现在努力学习，从句表示与过去事实相反的虚拟应该用 过去完成时表示， 只有 A 和B 符合虚拟条件， 但A 中 少if ， 虚拟句中省略if , 用倒装， 故 B 是正确的 。
D，中的should 不能表示与过去事实相反的虚拟。
因为此句讲的是与过去事实相反的情况，应该用过去时态的虚拟语气，即：if……had done，……should/would……
此句用的倒装句，因此应该选：C，had……done结构。不能选择表示与现在事实相反的D选项。
希望能帮到你！
这是一个虚拟条件句，去掉if的话主句要倒装，正确答案是C 你可以加上if把d带入原句
看看。if he should study harder 明显不对
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