— Why are you so popular with your students?
— As a teacher, I seldom give my students so difficult a problem ____ they cannot work out.
A.as | B.that | C.if | D.which |
推荐套卷
— Why are you so popular with your students?
— As a teacher, I seldom give my students so difficult a problem ____ they cannot work out.
A.as | B.that | C.if | D.which |