当我执行git pull origin [my branch name]时,它会显示Already up to date。我先尝试了git fetch origin [my branch name],然后尝试了git reset --hard FETCH_HEAD (),但我的本地副本仍然指向超级旧的提交。我也尝试过使用git checkout 1d5d525 ()重置为特定的提交,但它显示:error: pathspec '1d5d525' did not match any file(s) know