Walking on the ____ , the young couple talked about those unforg

Walking on the ____ , the young couple talked about those unforgettable days when they were studying at college.
A、sideway's
B、sidewalk
C、sideway
D、sidewalk's
【正确答案】：B
【题目解析】：根据句意 on the ___，判断空格为名词，排除ADsidewalk 和sideway 都有人行道的意思，但是他们搭配的介词不同，
on the sidewalk ；in the sideway因此此题选B