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一题英语Mary dropped in ____ Mr Smith,but he wasn' t at home,so

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一题英语
Mary dropped in ____ Mr Smith,but he wasn' t at home,so she went to drop in ____ Mr Smith's office.A.on,on B.at,at C.on.at D.at.on
句中dropprd in
一题英语Mary dropped in ____ Mr Smith,but he wasn' t at home,so
drop in 是顺便走访某人的意思,这题我选B
翻译是:玛丽拜访史密斯先生,但是他不在,所以她就去了史密斯先生的办公室.先看第二空at office是固定搭配.排除A,D,可是至于第一空我就不确定了,估计是at home,home省略