_____more about computers,we______him to work here.A.If he l

_____more about computers,we______him to work here.A.If he learns,would hire B.Had he learnt,would
have hired
C.If he learnt，would have hiredD.Has he learnt,would hire选什么？为什么？

答案：B
翻译：如果他以前要是学了更多有关电脑的知识,我们就雇佣他在这里上班了.
解析：这句话使用的是虚拟语气.根据虚拟语气的搭配：对过去事情的虚拟
主句使用 would have done,从句使用 had done,
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 移到从句
的句首,实行倒装.例如：
　 Were they here now, they could help us. =If they were here now, they could help us.他们现在在的话,就会帮助我们了.
　 Had you come earlier, you would have met him. =If you had come earlier, you would have met him.你来得早一点,就碰到他了.
四个选项只有B正确
A if 从句使用了一般现在时,而主句却是用了would一般过去时,时态相互矛盾.
C 缺少had
D has 改成had
如有疑问,请追问.
无疑后请采纳.
书山有路勤为径,学海无涯苦作舟.
-----------与君共勉-----------
再问： 那为什么是表示与过去事实相反呢？为什么不是表示与将来事实相反？翻译成（如果他将努力学习电脑知识，我们将雇佣他），请解释一下，谢谢
再答： 当然可以表示 与将来事实相反，但是题目中的选项没有符合的 。 如果表示与将来事实相反，主句用should/would等 + 动词原形，从句使用一般过去时/were+ 不定式 /should+ 动词原形 但是四个选项里没有符合这个结构的
再问： 你可不可以讲一下虚拟语气的具体用法，谢谢
再答： 虚拟语气用来表示说话人的主观愿望或假想，而不表示客观存在的事实，所说的是一个条件，不一定是事实，或与事实相反。虚拟语气通过谓语动词的特殊形式来表示。 用法及动词形式　　1、表示与现在事实相反的情况： 从句：If 主语+过去时(Be动词用were) 主句：主语+should/would/could/might+do eg：　 1．If I were you,I would take an umbrella. 如果我是你，我会带把伞。（事实：我不可能是你） 2．If I knew his telephone number,I would tell you. 如果我知道他的电话号码，我就会告诉你。（事实：不知道） 2、表示与过去事实相反的情况 从句：If 主语+had+done 主句：主语+should/would/could/might+have done　 eg： 1． If I had got there earlier,I should/could have met her. 如果我早到那儿，我就会见到她。 （事实：去晚了） 2．If he had taken my advice,he would not have made such a mistake. 如果他听我的劝告的话，就不会犯这样的错误了。 （事实：没有听我的话） 3、表示对将来情况的主观推测　　 主句：主语+should/would/could/might+do　 从句：①if+主语+were to do ②if+主语+should/would/could/might+do ③if+主语+did（动词过去式）/were [1] eg： 1．If he should come here tomorrow,I would talk to him. 如果他明天来这儿的话，我就跟他谈谈。（事实：来的可能性很小） 2．If there were a heavy snow next Sunday,we would not go skating. 要是他认识她的话，他肯定会去问候她了。 4、 当虚拟条件句的谓语动词含有were,should,had时，if可以省略，这时条件从句要用倒装语序，即把were,should,had等词置于句首，这种多用于书面语。eg： Should he agree to go there,we would send him there. 要是他答应去的话，我们就派他去。 Were she here,she would agree with us.