she will join us in the game is not decided yet.A. IfB. WhetherC. WhatD. While

问题补充：

she will join us in the game is not decided yet.

A. If

B. Whether

C. What

D. While

答案：

A. If

(答案→)B. Whether

C. What

D. While

解析：Whether …is not 引起主语从句.这话意思是:她是否参加我们的游戏还有确定。