【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

【答案】B
【解析】考查动词短语辨析。短语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；句意：由于良好的创业环境，很多大学生创办的生意都很成功。根据句意可知B正确。