i read english books( about )three times a week 用about,那用for

i read english books( about )three times a week 用about,那用for I read English ____twice a week这个句子,下划线处为什么要用about而不是for? Oh I exercise about three times a week怎样用中文翻译. l read English books(abot ) three times a week 为什么要填abot 每周几次（once/twice/three …times a week）前面用什么介词 A about B for C i read english stories [ ] twice a week A.about B.at c.for D about three or four times a week语句正确吗 Katrina reads English books three ( ) four times a week A at I have read three books about Harry Potter.(对three提问) English books about Chinese Culture for Sale.I have several read English books a week的中文翻译 three for about one week 翻译 昂.