27. Many countries are now setting up national parks animals and plants can be protected.(A) when (B

問題詳情

27. Many countries are now setting up national parks animals and plants can be protected.
(A) when
(B) which
(C) whose
(D) where

答案：D
難度：非常困難0
統計：A(0),B(2),C(0),D(0),E(0)