Jumping out of ____airplane at ten thousand feet is quite _____exciting experience

A./, the

B./, an

C.an. an

D.the, the

答案及解析： C

解析：

airplane 为可数名词，an airplane 表示泛指，而此处的experience表示“经历”，为可数名词，an exciting experience意为“一次刺激的经历”