american前面用a还是an

His accent proclaimed that he was an American.

他的口音表明他是一个美国人。

He speaks English as though he were an American.

他讲起英语来好像他是个美国人。

The bill was drawn on an american bank .

票据是一家美国银行支付的。

My american friends have been working on me .

我的美国朋友们教会了我。

A new spirit entered american fiction .

一种新精神注入了美国小说。