My mom once worked in a very small village school，which is______

My mom once worked in a very small village school，which is________ only on foot.
A、acceptable
B、adequate
C、accessible
D、appropriate
【正确答案】：C
【题目解析】：acceptable 可接受的；adequate 充足的；accessible 可接近的，可到达的；appropriate适当的；句意：我妈妈曾经在一个很小的乡村学校工作，那里只有步行才能______。因此C 符合题意。