________ THEN WHAT I KNOW TODAY, I WOULD HAVE SAVED MYSELF A LOT O...

36. - BAI TAP TRAC NGHIEM CAU DIEU KIEN
BAI TAP TRAC NGHIEM CAU DIEU KIEN
36. ________ then what I know today, I would have saved myself a lot of time and trouble over the years.a. Had I known b. Did I know c. If I know d. If I would know