国家开放大学 / 国家开放大学
--Excuse me, when is the next flight from London due to arrive?
--__________________.
A. Until the next one.
B. In half an hour.
C. An hour before.
D. Before another one.
--__________________.
A. Until the next one.
B. In half an hour.
C. An hour before.
D. Before another one.
参考答案：