A man may take to drink because he feels himself to be a failure

A man may take to drink because he feels himself to be a failure, and then fail ______ completely because he drinks.
A、all the more
B、more than
C、less than
D、more and more
【正确答案】：A
【题目解析】：一个人可能因为觉得自己是个失败者而染上酗酒的恶习，然后又因为酗酒而更加彻底地失败。all the more是副词性短语，意为更加。故选A。