【题目】 Many businesses started up by college students have _________ thanks to the comfortable climate for business creation.
A. fallen off B. taken off
C. turned off D. left off
在线课程【答案】B
【解析】试题分析：考查动词短语辨析。fall off跌落，下降；take off起飞，成功，受欢迎；turn off关闭；leave off停止，中断；根据句意可知B项正确。