问题详情:
The notice on the wall is meant to ________ the unwanted visitors, especially during working hours.
A. keep up B. keep off
C. keep from D. keep back
【回答】
B keep up“维持;继续”; keep off“离开;使不接近”; keep from“阻止;使免于”; keep back“阻挡;抑制”。根据句意,B项最佳。
知识点:动词
题型:选择题