I had known her long before. 为什么要用过去完成时?

I had known her long before. 为什么要用过去完成时? ______?-I got know her in2007.A：When did you get to know her?B：How long have known her? 1:-------have known each other since fiver years ago .A:As long as I have traveled B :Now that I have traveled C:Much as I have traveled D:As I traveled so much 为什么选C ,2:Had I known her name ,___.A:or does she know mine B :I would have invite 英语：1.I would have phoned you ,if I ___ time.( )A.had had B.have had C.had2.If I __ her tomorrow,I would pass your note to her.( )A.see B.shall see C.saw3.__,I'd have told you.( )A.If I would have known it B.If I had known it C.Had I known it4.T (1/2)I wish I had known that Ann ___ill .I would have gone to see her . even if i had known her address,i () time to to write to her答案是might not have had为什么? If I ________ that she was ill,I would have gone to see her．A.knew B.know C.have known D.had known 翻译One I have known a very long time I_____her for a long time,but I think she hasn't known meAhave known Bhad known Cknown Dknew I also had such a long 翻译下面的句子：They had not known each other long before they got married. Mary is a kind girl.I ( )her for a long time.Mary is a kind girl.I ( )her for a long time.A.have been knowing B.have knowC.had know D.will know 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 （同义句）I had not seen my friend Amy for a long time,so last Sunday I went to visit her. 1.I have known her for long.(变为一般疑问句,并作否定回答） 2.I have lived here since Iwas born.补充2.（变为一般疑问句,并作肯定回答） i don't know her,（ ） i’ve known her for two years He shook hands with her as though they had known each other all their lives.英译汉