before后可以接half an hour

before后可以接half an hour where were you后应该ten minutes before half an hour ago now jus He was here().A.half an hour before B.half hour ago C.half a I will remind you again half an hour before he half an hour later half an hour? 是half hour还是half an hour? half an hour or a half hour? a half hour还是half an hour? half hour =half an hour an hour and half还是an hour and a half May you be in heaven a half an hour before the devil knows y