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。
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