She woke him for his medicines （ ） throughout the night.

She woke him for his medicines （ ） throughout the night.
A、at large
B、at intervals
C、at ease
D、at random
【正确答案】：B
【题目解析】：本题考查介词短语辨析。at large“整个地”， at intervals“每隔一段时间“， at ease”舒适地”， at random“随机地”。句意：她夜里每隔一段时间就叫他起来服药。故选B。