Tom has been out of work for two years so he has difficulty.A. earning livingB. earning h

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。