问题补充：
---Where is the manager? I have something important to discuss with him.
--- He is at the airport now. He for Beijing.
A. has left
B. leaves
C. left
D. is leaving
答案：
A. has left
B. leaves
C. left
(答案→)D. is leaving
解析：考查时态：句意：经理在哪里？我有重要的事情要和你讨论。--他现在在机场。马上去北京。从句意看，现在在机场，应该很快要去北京，用现在进行时表示一般将来时。
