she was invited to the ball made her very happy.
A. Whether
B. That
C. Because
D. What
网友回答
A. Whether
(答案→)B. That
C. Because
D. What
解析：
试题分析: 考查主语从句。句意：她被邀请去舞会使得她非常高兴。从结构判断“she was invited to the ball”是主语从句，从句意思完整，不缺少成分，所以A，D选项排除。C选项because只引导原因状语从句，而B选项that 引导主语从句，不做成分，只起连接作用，所以B为正确选项。