“He had already posted the letter by five yesterday.”为什么要用介词"by"?这是一道选择题：选项有A.on B.at C.by D.for我选择的是B,却不知道错误原因,希望告知!

He ()when you came.A.will arriveB.had already arrivedC.would already arriveD.has already arrived He had finished his homework already.(改为否定句) he,had,breakfast,already,his,has.连词成句 He had already gone & He has already gone有什么区别 我怎么感觉意思差不多啊 he has already had enough food 改为否定句 he _____ ______ ______ enough food___. He had already gone home.（否定句）He ____ ____ home ____. He had several ____ dollars,he has helped __ people already. My heart had already we already had he had already left home when his son arrived home 改为疑问句, He has already had supper 改否定句和一般疑问句 He came back late,____which time all the guests had already left.空里填after为什么不行 He has already had lunch.（改为一般疑问句,并作肯定回答） What he said already ___(记录）by the police.had been recorded His brother had already posted by the time he _____(arrive)home. On my arrival home,I found he had gone already.my 是不是该改成 it figures one had meet the perfect guy and he'd already have perfect girl he had already died 能用这个结构吗我们老师说这是错误的……