問題詳情
20. Keven, on behalf of his company, successfully signed a contract with a multinational corporation this morning. He ecstatic at that moment.
(A)can't be
(B)couldn't have been
(C)must be
(D)must have been
參考答案
答案：D
難度：非常簡單1
統計：A(0),B(0),C(0),D(3),E(0)