If you are free to walk through out city, please us.A drop in B drop in at C. drop in on

发布时间：2020-08-22 09:10:15


If you are free to walk through out city, please      us.
A drop in       B drop in at      C. drop in on

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解析：A.drop in 顺路拜访，B drop in at +地点顺路拜访某地，C.drop in on sb.顺路拜访某人。句中是us，故选C。
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