Although punctual himself, the professor was quite used _____ late for his lecture. 

A．to have students

B．for students' being

C．for students to be

D．to students' being

人民币加快升值，已经对我国经济和人民生活产生影响。下列属于这一影响的有[ ]

①有利于促进外贸出口发展方式的转变

②有利于我国国际收支平衡

③有利于扩大出口，增加贸易顺差

④有利于推动我国国民出境旅游、留学等活动

A．①②③

B．①②④

C．②③④

D．①③④