請問一題文法

[a109102a (胖胖胖)]

I find it hard to concentrate on studying with the radio ______.
(A) turning on
(B) on
(C) be turned on
(D) to turn on

答案為B 為什麼A不行呢

--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 111.83.47.213
※ 文章網址: https://www.ptt.cc/bbs/TOEIC/M.1542718259.A.0F9.html
推 mungbeansoup: on off 本身就有開關意味， 這邊若強調動作turn要使
→ mungbeansoup: 用過去分詞turned on才對on (廣播是被開的)
→ a109102a    : 了解感謝