I’m progressing in physics ____ the teacher’s well-organized teaching and exact explanation．

1. A.
   because
2. B.
   as a result
3. C.
   as
4. D.
   as a result of

I’m progressing in physics ____ the teacher’s well-organized teaching and exact explanation．

       A．because        B．as a result      C．as          D．as a result of

I’m progressing in physics ____ the teacher’s well-organized teaching and exact explanation．

A．because        B．as a result          C．as          D．as a result of

I’m progressing in physics ____ the teacher’s well-organized teaching and exact explanation．