I was told to meet Mr. Green at the airport. But I dont knowhe will arrive.A. whereB. why

问题补充：

I was told to meet Mr. Green at the airport. But I don knowhe will arrive.

A. where

B. why

C. how

D. when

答案：

A. where

B. why

C. how

(答案→)D. when

解析：本题考查特殊疑问词的选择。

句意为“我被通知去机场接格林先生，但是我不知道他什么时候到达”。故选D。