I arrived at the airport the plane had taken off.A. afterB. whileC. whenD. before

问题补充：

I arrived at the airport the plane had taken off.

A. after

B. while

C. when

D. before

答案：

(答案→)A. after

B. while

C. when

D. before

解析：此题重点考查对语句的理解，根据对字面的理解可知A符合题意。