单项选择题

Because he is busy making money now, he is ______ of new developments in his original field.

A．ignorant
B．innocent
C．illiterate
D．negligent
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单项选择题
He broke a piece of glass but he didn' t ______ a pin.
A．care
B．mind
C．consider
D．matter
单项选择题
And now we must be off ______ . It is eight already.
A．by accident
B．on average
C．by chance
D．right away
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