In order to look after her sick mother in the hospital,she asked for a two-month's ___

选C leave
首先leave和off都可表示请假
如果这个题要用off的话，得这么用a two-month off,不加's就对了

XX-day off 请几天假

off有表示不工作，休息

leave 表示离开

c
ask for leave:请假

C
ask for a leave 请假
还有比如 on a sick leave 在病假期间

C 请假

leave