"One of them has __engineer."中为什么要填turned而不是been、become、got into?

问题描述:

"One of them has __engineer."中为什么要填turned而不是been、become、got into?

空格应该填“成为”,而且空格后面满意冠词,所以如果要填been become,got into的话,空格后面要有an,但turn后面不跟冠词.