4月20日晚在中央电视台“情系玉树，大爱无疆--抗震救灾大型募捐活动特别节目”．据统计，这台募捐晚会共募得善款21.75亿元人民币．用科学记数法表示为______元人民币．

I am afraid I would have little influence over her________her mind was made up on any subject. [ ]

A. until  

B. once

C. though  

D. unless