问题补充：
In that school, German is compulsory for all students, but English and French are.
A. special
B. regional
C. optional
D. original
答案：
A. special
B. regional
(答案→)C. optional
D. original
解析：
试题分析:句意：在那所学校，德语对所有学生来说是门必修课，而英语和法语却是选修课程。A特殊的；B区域的；C选择的；D最初的。根据but可知与前面compulsory构成对比关系，选C。
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