問題詳情

21.（　）Jacob _____ care of the dog _____ he found it at the door a year ago.　　　　
(A) took ; if
(B) has taken ; since
(C) is taking ; while
(D) has been taken ; after

參考答案

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