It was _____ computer games that cost the boy a lot of time that he ought to have spent on his lessons.

A．to have played

B．playing

C．played

D．having played

斯塔夫里阿诺斯在《全球通史》中写道，经过两次世界大战，欧洲政治家们清醒地认识到“欧洲不再是欧洲人的欧洲”。欧洲政治家们得出这一认识主要是基于(    )

A．二战使欧洲丧失了世界经济中心的优势地位

B．二战后欧洲经济凋敝、社会动乱

C．二战后欧洲来自苏联的威胁和美国的渗透、控制加剧

D．二战后经济全球化趋势不断加强