(2013·江苏南通市二模)We have hurried all the way to the airport — the flight was called off because of the foggy weather.
A. mustn't
B. couldn't
C. needn't
D. wouldn't
网友回答
A. mustn't
B. couldn't
(答案→)C. needn't
D. wouldn't
解析：选C 考查情态动词。句意：我们本不必一路上都着急去机场的——航班因为大雾天气被取消了。needn't have done表示“本不必做却做了”，符合句意。