We generally have four people working in the shop, but at () per

We generally have four people working in the shop, but at () periods we employ extra hands.
A、top
B、rush
C、tip
D、peak
【正确答案】：D
【题目解析】：句意：我们店里一般有四个工作人员，但在高峰期我们会多雇一些人手。at peak periods为固定短语，意为在高峰期，在旺季”，故选D。