— I think students should have mobile phones to call their parents. —. They often use them

问题补充：

— I think students should have mobile phones to call their parents.

—. They often use them to play games instead.

A. I hope so

B. I don agree

C. No problem

D. Good idea

答案：

A. I hope so

(答案→)B. I don agree

C. No problem

D. Good idea

解析：句意：—我认为学生应该拥有手机来给父母打电话。——我不同意，他们经常用手机来玩游戏。

A是我希望如此，B是我不同意，C是没问题，D是好主意，根据句意此题应选B。