is the film called?-How to Train Your Dragon.A Which B Why C What D When

问题补充：

--- is the film called? ---How to Train Your Dragon.

A Which B Why C What D When

答案：

解析：A.哪一个 B.为什么 C.什么D.什么时候。句意：这部电影名叫什么？——训龙记。