单项选择题

Our principal, a mean old lady, ______ a travel for ages, but to our great disappointment nothing has happened yet.

A．was promising
B．has been promising
C．has promised
D．promised
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单项选择题
It's self-evident that no one would have time to know everything going on in the world.
A．there is
B．as is
C．it is
D．what is
单项选择题
Many automobile accidents were ______ careless driving.
A．attributed to
B．resulted in
C．contributed to
D．raised from
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