問題詳情

32. I won't tell the student the answer to the math problem until he ____on it for more than an hour.
(A). has been working
(B). will have worked
(C). will have been working
(D). had worked

參考答案

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