---Tom’s father looks very serious.he is very kind.A. ThoughB. IfC. AndD. But

问题补充：

---Tom’s father looks very serious.

--- he is very kind.

A. Though

B. If

C. And

D. But

答案：

A. Though

B. If

C. And

(答案→)D. But

解析：Though虽然，尽管；if是否，如果； And和，并且；But但是。句意：汤姆的父亲看起来非常严肃。——但是他非常善良。结合语境可知选D。