20世纪下半叶出现了以美苏对峙为标志的、长达40多年的“冷战”局面，根据你学习过的有关“冷战”史实，请判断以下属于“冷战”范畴的有

①杜鲁门主义的出台 ②马歇尔计划的实施 ③科索沃战争 ④北约和华约两大军事集团的建立[ ]

A．①②③④

B．①②③

C．①②④

D．②③④

He ________ all his aims. But his efforts in the past few years have been praise-worthy.

A．could have achieved

B．wouldn’t have achieved

C．must have achieved

D．may not have achieved