[問題]2001年 1月 Q8 (structure)

[克里米雅]

8. The most important chemical catalyst on this planet is chlorophyll, -------carbon dioxide and water react to form carbohydrates.

1.whose presence
2.which is present
3.presenting
4.in the presence of which

答案是4, 請問3哪裡錯了 謝謝

[Bill]

C-presenting是分詞表動作，因此和後面的react衝突