Question

Jack is often seen _______ basketball with his friends after school.

A．play

B．to play

C．to playing

D．played

Answer 1

B

本题的含义是经常看见Jack和朋友们在一起打篮球，是被动句，看到某人做某事，
在英文中可以说see sb doing或see sb do，在被动句中，后者do变成to do，
故本题只能选B。