It's __great fun to start the trip at ____altitude of more than 5_英语解答

It's __great fun to start the trip at ____altitude of more than 5000meters
A.a;an B.a;the C.the;an D./;an

人气：107 ℃　时间：2020-03-26 23:01:26

解答

选D
fun 抽象名词,前面可不用限定词,altitude可数名词,不能单独出现,因为其以元音开头,用an