问题补充：
I’d like to see you off at the airport. Could you tell me ?
A. when your plane took off
B. when did your plane take off
C. when your plane takes off
D. when does your plane take off
答案：
A. when your plane took off
B. when did your plane take off
(答案→)C. when your plane takes off
D. when does your plane take off
解析：本题考查宾语从句。宾语从句要用陈述语序，排除B 和 D；结合I’d like to see you off at the airport，可知不是过去的事，排除A。
