It's just that hadn't been left to you.

It's just that hadn't been left to you.在下深表感激 M:It's not just the book,it's the course as well?W:Yeah,in a way,although the course itself isn't really that bad,a lot of it is pretty good,in fact,and the lecturers are fine.It's me,I suppose.You see,I wanted to do philosophy rather than English,but my parents took me out of it.M:So the course is OK as such.It's just that hadn't been left to you.You would have chosen a different one.其中倒数第二句为该句！