— How pleasant is to go fishing with my father! — Yes. Parents and children should spend

问题补充：

— How pleasant is to go fishing with my father!

— Yes. Parents and children should spend more time together.

A. that

B. he

C. this

D. it

答案：

A. that

B. he

C. this

(答案→)D. it

解析：句意：和爸爸一起去钓鱼多么高兴啊！是的，父母和孩子应该多花时间在一起。It在句中作形式主语，真正的主语是后面的不定式；故选D。