問題詳情

16. You knew that before, ______?
(A) did you
(B) aren't you
(C) isn't it
(D) didn't you

參考答案

答案:D
難度:簡單0.867667
統計:A(55),B(32),C(10),D(636),E(0)

用户評論

miao530】評論

knew:過去式-did 

relita0322】評論

附加問句,有be v用be,無be用助動do, does, did, 前面肯定後面否定