【题目】After he got in touch with the Red Cross, Mr. Green ______ helping homeless women and children to a safe place.
A. set out B. set about
C. set off D. set down
在线课程【答案】B
【解析】
试题分析：考查动词短语。句意：接触过红十字会之后，格林先生开始帮助无家可归的妇女儿童，帮他们找到一个安全的地方居住。A. set out出发；B. set about 着手，开始做；C. set off 动身；D. set down放下，记下；根据词义，故选B项。