问题补充:
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
答案:
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。