Before there was no direct airlineTaiwan and the mainland.A. inB. atC. alongD. betwe

问题补充：

Before , there was no direct airlineTaiwan and the mainland.

A. in

B. at

C. along

D. between

答案：

A. in

B. at

C. along

(答案→)D. between

解析：in在里面；at在一点；along沿着；between在两者之间。句意：在之前，在台湾和大陆之间没有直达航线。结合语境可知选D。