Had I known about this computer program,a huge amount of time and energy （would have been saved）为什么不是 would have saved 有什么区别吗 能否详细讲讲

He thought I had known the fact.But a____-,I knew nothing about it. I wish I'd known about that rule earlier 其中'd是哪个单词?如题,would?had? He lost his left leg.If I ( )more about going first aid,Icould have helped.A.knew B.have known C.had known D.would know说明原因 I have known nothing about everything是什么意思? so little (did i know) about this theory that the lecture was totally beyond me.为何 (did i know) 不用（had i known）? 英语选择题had i known about this computer program,a huge amount of time and energy,A,wou...英语选择题had i known about this computer program,a huge amount of time and energy,A,would have been saved,B,had been saved .CWill be saved .D,was sa I had known her long before. 为什么要用过去完成时? 1.if you _______more about giving first aid,you______us had known,could have helped2.Never _____such an animal as Jim described after his coming back from the New Zealand.have i heard 还是 did i hear,还是had i heard问:1中had known是根据could Little ___ about his hair_raising adventure when I first met him A I had known B I have knownC do I knowD did I know考什么知识啊,有什么固定的方法吗?为什么选D啊 I am thinking of known more about this play 意思 i am shocked,little is known about sth.语法对么? had i known it ,i would have..HAD在句首? have had done与had have done区别——，I'd have told you.A.If I would have known B.If I had have known C.Had I known D.Should I know i knew a little about that country before i _____ there several years ago.为什么填went?如果用went的话,那前面不就应该用 i had known了么? How I wish I____you____there,too yesterdayA.knew,were B.had known,were C.knew,had been D.had known,had been 88：He had known a great deal about business.about business 在句中成份是什么?88：He had known a great deal about business.about business 在句中成份是什么? So little ( ) know about physics that the lecture was completely beyond meA I knew Bdid I know CI had known Dhad I known我想问下为什么不能选D 由题目来看我可以认为我已经知道我对物理了解很少,之后对课程完全不能 Had I known about this computer program,a huge amount of time and energy （would have been saved）为什么不是 would have saved 有什么区别吗 能否详细讲讲