A:used to be , change
B:used to be , changed
C:has been , has changed
D:is , has changed
寓言“鹬蚌相争、渔翁得利”和成语“趁火打劫”用来比喻乘人之危谋取私利,在第二次鸦片战争中干此勾当,强占中国大片领土的国家是( )