They had a dispute over who should be his dance partner.
老师,over 在文中是副词吗?它是修饰动词的吗?
a dispute over who should be his dance partner:
over 是介词,不是副词,意为“关于;有关”,等于about 之意。本句over 若是副词,那样,who should be his dance partner 这个从句,怎么样处置?over who should be his dance partner 作定语,修饰dispute。