问题补充：
The young girl sitting next to me on the plane was very nervous.She before.
A. hasn’t flown
B. didn’t fly
C. hadn’t flown
D. wasn’t flying
答案：
A. hasn’t flown
B. didn’t fly
(答案→)C. hadn’t flown
D. wasn’t flying
解析：sitting next to me，后置定语修饰The young girl，前面句子用 was ，没做过飞机应是过去的过去。选C
