单选题
This hard-working couple was able to put their two sons through college on their own. A. by their own efforts B. in their own way C. in their own interests D. in their own light
【正确答案】
A
【答案解析】on one's own：独立地，靠自己的努力，与by one's own effort意义接近；in one's own way：以自己的方式；in one's own interest：为了自身的利益；in one's own light：以自己的眼光