单选题 The objective of this popular consultation is to determine,______, the final political status of the region, whether to remain of the country as a special district, or to part from it.(浙江大学2010年试题)

A、 once upon a time
B、 once and again
C、 all at once
D、 once and for all

【正确答案】 D

【答案解析】解析：在给出的选项中：once upon a time“从前”；once and again“再三”；all atonce“突然”；once and for an“彻底地”。所以，正确答案是D。