問題詳情

47. We ______ for 20 years.
(A)are in this line of business
(B)do business with European importers in washing machines
(C)have been exporting printers
(D)have established here as general exporters。

參考答案

答案：C
難度：適中0.521739
統計：A(3),B(0),C(12),D(6),E(0)