Tom has been out of work for two years, so he has difficulty .
A. earning living
B. earning his living
C. to earn livings
D. to earn his living
网友回答
A. earning living
(答案→)B. earning his living
C. to earn livings
D. to earn his living
解析：
考察固定结构。Have difficulty in doing sth做某事有困难；earn one’s living谋生；故B正确。