单项选择题

 I'm sorry （） so long. I forgot to tell you in advance that I would have a meeting this afternoon. 

A．to keep you waited
B．to keep you waiting
C．tohavekeptyouwaiting
D．to have kept you waited

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（）inthepark,IcameacrossmyformerEnglishteacher.

A．If wandered
B．If wandering
C．While wandered
D．While wandering
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Seldom（）anymistakesduringmypast10yearsofworkinghere.

A．I did make
B．did I make
C．I would make
D．I made
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