问题
选择题
Catherine's mother doesn’t allow her to go anywhere outside the town ________ another member of the family is along.
A．without
B．if
C．unless
D．with
答案
答案：C
题目分析：句意：凯瑟琳的母亲不允许她去镇外的地方，除非有家里其他人跟着一起。分析语境可知unless
another member of the family is along为unless引导让步状语从句。故选C。