I had to buy ____ of the twenty books because I didn't know

I had to buy ____ of the twenty books because I didn't know I had to buy __of the books because I didn't know which one 1、I had to buy _____ these books because I didn't know which 英语单项选择（解析）I had to buy ( )these books becauce i didn't know I didn't buy that dictionary because it ____. why didn't you buy the MP4you had wanted ? I had planned to. i didn't go to see the film （because i had many things to do I don`t want to buy any of these books again.I`ve got ____.A Shirley had to buy ___ these CDs because she didn't know whi Tom had to buy ___these CDs because he didn't know which one Shirly had to buy _____ these CDs because she didn't know wh I don’t know which kind of camera （）（buy）because both of the