Tom took a taxi to the airport, only ________his plane high up in the sky.[ ]

A. finding  

B. to find

C. being found  

D. to have found

在一个现代化的体育馆内，铺设了20块长30米，宽3.5米，厚0.3米的木质地板，这个体育馆的面积有多大？铺设地板至少要用木材多少立方米？