The notice hanging on the front wall is meant to [_] the unwanted visitors, especially at working hours. A.keep out B.keep in C.keep from D.keep up

The notice hanging on the front wall is meant to [_] the unwanted visitors, especially at working hours.

A.keep out
B.keep in
C.keep from
D.keep up

出自：河南财经政法大学-金融学-大学英语4

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