問題詳情

23.In the 1930s, the scientists discovered that rats__________ a low calorie diet lived longer.
(A)gave
(B)gives
(C)which gave
(D)given

參考答案

答案：[無官方正解]
難度：非常困難0
統計：A(1),B(0),C(0),D(0),E(0)