—There is only 15 minutes left for work. What shall we do?

—My God！There are always not any taxis when you want_______

A．one

B．it

C．that

D．any

可在密集建筑群中施工。尤其是用于二层以上地下室的建筑物，可配合“逆筑法”施工而更显出其独特作用的基础为（）

A.桩基础

B.地下连续墙

C.沉井基础

D.独立基础