— Four students in Qingdao stood in line against a man to save a woman teacher at the school gate.
— _________ great courage they had!
A:How
B:What a
C:What
D:How a
①年龄小,发展不成熟
②是国家的希望、民族的未来
③生活在复杂的社会环境中
④是社会主义事业的建设者和接班人