“冷战”局面的形成是由于

①美国试图称霸世界②苏联政治军事力量增强③欧亚社会主义阵营形成④美苏展开核军备竞赛[ ]

A．①②③

B．②③④

C．①②

D．③④

Do you know how long it is ______we last went to the theatre?[ ]

A. since

B. before

C. when

D. that