Lin Feng is said ____ abroad, but I don’t know which country he studied in.

A．to study

B．to be studied

C．to have studied

D．to be studying

广义的游戏环境指游戏活动得以实施的一切条件的总和，包括物理环境和()。

A．心理环境

B．室内环境

C．户外环境

D．精神环境