Thank you for giving up your coffee break to help. I know you always need after three clas

问题补充：

Thank you for giving up your coffee break to help. I know you always need after three classes.

A. that

B. one

C. it

D. this

答案：

A. that

(答案→)B. one

C. it

D. this

解析：one是泛指，同名异物，在这里相当a break,句意：感谢你放弃你的休息时间来帮我，我知道上完三节课后你总是需要休息一会。故选B。