Migration in Ireland declined sharply ___________.

Migration in Ireland declined sharply ___________.
A、during WWI
B、in recent years
C、in the early decades of the 20th century
D、after the establishment of the Irish Free State
【正确答案】：D
【题目解析】：本题考查爱尔兰的移民。根据课本P337可知，爱尔兰自由州建立后，爱尔兰的移民数量急剧下降。