問題詳情

37. Football teams don’t play in the Superbowl Championship _______ they win either the National or theAmerican Conference.
(A) but
(B)so
(C) then
(D)unless

參考答案

答案：D
難度：適中0.6
統計：A(20),B(8),C(2),D(45),E(0)