thank god you are safe i stepped back,just ___to avoid the racing car

题目

thank god you are safe i stepped back,just ___to avoid the racing car
i stepped back,just ___to avoid the racing car
A in vain B in case C in need

答案

in vain 徒劳
in case 偶然
in need 急需
本句是说“我往后退,偶然躲过了赛车”,选B