按《黄帝内经》所说"谨察阴阳所在而调之，以平为期"的宗旨进行调治，属于调养的是（）

A.天癸

B.冲任督带

C.胞宫

D.脏腑

E.肾

(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