你可能感兴趣的试题
tried have tried had tried have been trying
had trapped had been trapping had been trapped would have been trapped
had waited have been waited had been waiting will have been waiting
tried have tried had tried have been trying
have been working am working had worked will work
had been working would work have worked am working
had been chatting had chatted were chatting have been chatting
had been chatting had chatted were chatting has been chatting
was working had worked worked have been working
has lasted has been lasting lasted had lasted
I heard I had heard did I hear have I heard
paint had painted was painting have been painting
have fallen asleep have been asleep had fallen asleep had been asleep
had walked have been walking walked had been walking
had walked walked have been walking am walking
was working had worked worked have been working
had waited have been waited had been waiting will have been waiting
has been lasted has been lasting lasted had lasted
the train to start for the train starting for the train to start for the train start
had walked walked have been walking am walking