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单项选择题

The achievements are ______ a great importance.

A．for
B．of
C．to
D．at
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单项选择题He died ______ cancer ______ a winter night.

A．of, at
B．from, in
C．for, during
D．of, on

单项选择题Mr Green went home ______ Christmas, the children had a good time ______ Christmas Eve.

A．on, on
B．at, on
C．in, in
D．at, at