问一道0101的语法

paracicyUID: 165758

8. The most important chemical catalyst on this planet is chlorophyll, -------carbon dioxide and water react to form carbohydrates.
  (A) whose presence
  (B) which is present
  (C) presenting
  (D) in the presence of which

把d添上是这句话:
The most important chemical catalyst on this planet is chlorophyll,  in the presence of which carbon dioxide and water react to form carbohydrates.

这是那种prep+which的定语从句吧,就是介词提前.
如果是,那把那个介词还原回去应该怎么还原啊?
我怎么想不通???

3ks~

barbarcanUID: 2152091

carbon dioxide and water react to form carbohydrates in the presence of chlorophyll .
11t成功！！

paracicyUID: 165758

3q
bless all 11ters!!!!