27. The boys aren’t playing in the park now. But they were there three hours ______

問題詳情

27. The boys aren’t playing in the park now. But they were there three hours _______.
(A) ago
(B) before
(C) later
(D) then

答案：A
難度：簡單0.777778
統計：A(21),B(0),C(2),D(2),E(0)