【题目】The poor old man made a living by ________ food from door to door.
A.standing for
B.calling for
C.begging for
D.leaving for

【答案】C
【解析】句意：那位可怜的老头靠挨家挨户乞讨为生。standing for”代表“；calling for”需要“；begging for“请求，乞讨”；leaving for”动身去“。选C。