单项选择题

I worked so late in the office last night that I hardly had time ______ the last bus.

A．to have caught
B．to catch
C．catching
D．having caught
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单项选择题
There are over 100 night schools in the city, making it possible for a professional to be reeducated no matter ______ he does.
A．how
B．where
C．what
D．when
单项选择题
I've kept up a friendship with a girl whom I was at school ______ twenty years ago.
A．about
B．since
C．till
D．with
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