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
I was unaware of the critical points involved, so my choice was quite_______________.
A．arbitrary
B．rational
C．mechanical
D．unpredictable
单项选择题
She worked hard at her task before she felt sure that the results would ____________ her long effort.
A．justify
B．testify
C．rectify
D．verify
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