Although he was will his father came back.A. butB. andC. soD. /

问题补充：

Although he was will,his father came back.

A. but

B. and

C. so

D. /

答案：

A. but

B. and

C. so

(答案→)D. /

解析：

这题考查复杂句的用法，although引导让步状语从句，后面要接主句，不能加连词了，所以选D。