John ___________ on his friend when he w...

John ___________ on his friend when he went to Guangzhou last month.

A. dropped on B. dropped in

C. dropped at D. dropped for

B 【解析】试题分析：句意：当约翰上个月去广东的时候他碰到了他的朋友。A drop by 顺便拜访 drop on 突然访问。前者强调顺便，后者强调偶然动词词组drop in，顺便或偶然到访（某人或某地） drop in on sb.是顺便拜访考点：考查固定短语。

考点分析：

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