Ⅲ. Selling books to parents of failing pupils for a commission
A. Ⅰ only
B. Ⅱonly
C. Ⅲ only
D. Ⅰ,Ⅱ and Ⅲ
Answer:D
Ⅲ. Selling books to parents of failing pupils for a commission
A. Ⅰ only B. Ⅱonly C. Ⅲ only D. Ⅰ,Ⅱ and Ⅲ