18.The manager ___ the workers how to improve the program since 9 a.m.　　(A)has told (B)is telling (C

問題詳情

18.The manager ___ the workers how to improve the program since 9 a.m.　　
(A)has told
(B)is telling
(C)has been telling
(D)will have told

答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)