A:half not as wide a
B:wide not as half a
C:not half as wide a
D:as wide as not half
清末著名诗人丘逢甲《春愁》“春愁难遣强看山,往事惊心泪欲潸。四百万人同一哭,去年今日割台湾。”诗中“往事”是指什么战争的失败( )