I didn't see him,but i _____(hear)him ____(go)downstairs

I ____(see)him,but he didn't see me I didn't see him,but i _____(hear)him ____(go)downstairs you didn't see him and____did i John looked unhappy when I went to see him yesterday evening,but I didn't为什么填 was troubling 请问I didn't see him和I haven't see him的区别 I happy to see him,but I didn't have timeI happy to see him,but I didn't have time.A.will have been B.would be C.will be D.would have been i didn't see John looked unhappy when i went to see him yesterdayJohn looked unhappy when i went to see him yesterday,but I didn't know what he _______(think ) about.请回答尽可能详细,包括答案和解析, i was ___ him last wednesday but he didn't comeA about to see B to see C about to have see D to have see说明选与不选的理由 At（）,I didn't know him,but now I doAt（）{one适当形式填空},I didn't know him,but now I do NOT BECAUSE OF WHAT I SAW,BUT BECAUSE OF WHAT I DIDN'T SEE NOT BECAUSE OF WHAT I SAW,BUT BECAUSE OF WHAT I DIDN'T SEE But I didn`t do! didn't see him yesterday-oh,but youA;ought toB;should have C;can't haveD;may have I didn't see him __ a year.填介词A.for B.in C.on i kept telling him that he should study hard but it didn't find itit didn't help 啥意思 选择 You see, he's failed again.You ____ him more help.But you didn't.You see, he's failed again.You ____ him more help.But you didn't.A.ought to give B.ought to have give I called him three times last night,but it was s_____ that he didn't answer I asked him for some oil,but he didn't have ( ).