問題詳情

【題組】45.Sara did a great job today. She ______ a lot this past week.
(A) cannot be practicing
(B) must be practicing
(C) cannot have practiced
(D)must have practiced

參考答案

答案：D
難度：非常困難0
統計：A(1),B(1),C(0),D(0),E(0)