They are twins (双胞胎) but they look.A. good-looking B. sad C. different

问题补充：

They are twins (双胞胎), but they look.

A. good-looking B. sad C. different

答案：

解析：good-looking好看的；sad伤心的；different不同的。句意：他们是双胞胎，但是他们看起来不同。故选C。