Sine the 1960s, ______ has become the mainstay of the Irish econ

Sine the 1960s, ______ has become the mainstay of the Irish economy.
A、manufacturing
B、mining
C、energy
D、animal husbandry
【正确答案】：A
【题目解析】：自20世纪60年代以来，制造业一直是爱尔兰经济的支柱。