28. (A) When they become escapees. (C) When they get too old.(B) When they are no longer useful. (D)

問題詳情

28.
(A) When they become escapees.
(C) When they get too old.
(B) When they are no longer useful.
(D) When they become ill.

答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)