Thenoticeonthewallismeantto

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