单项选择题

He used to be so cautious that his ______ was a surprise to every one of us.

A．blunder
B．blunt
C．blank
D．blaze
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单项选择题
Having said he would not make a long speech, he ______ doing exactly that.
A．commenced
B．commended
C．initiated
D．decided
单项选择题
The high ______ of road accidents on the super high way is giving cause for serious concern.
A．coincidence
B．occurrence
C．circumstance
D．occasion
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