David Graddol concludes that monoglot English graduates face a bleak economic future as qualified multilingual youngsters from other countries are proving to have a competitive advantage over their British counterparts in global companies and organizations. 我想问的是qualified multilingual 两个形容词并列出现是什么用法？前面的AS是什么意思？are proving应该用被动语态才合理吧？为什么是主动语态？