auto前加a还是an

auto前加a还是an？

前面加an，例如：

1.Imagine you ask an auto technician to estimate the cost of car parts.想象这种情况，你让汽车技术人员估计汽车零件的成本。

2.An auto industry that was flat lining is once again the heartbeat of American manufacturing ，曾经濒临死亡的汽车产业再次成为美国制造业的核心，

3.He worked with parts that he bought from an auto supply store and a Wal-Mart store.他从汽车用品店和沃尔玛超市购买配件来组装。

答案是an因为发音是元音