2000-01-07

7. __ ballet dancers learn five basic positions for the arms and feet.

A. All of  B Of every C. All  D. Every

I select "all of" but the answer is "all". Actually, when I met this question, I have no idea and

answer it by feeling. Any one can tell me how to differenciate "all of" and "all" here.

Thank you

the same question.

I chose "all", but I don't know the reason.