单项选择题

The wood was so rotten that, when we pulled, it ______ into fragments.

A．broke off
B．broke away
C．broke through
D．broke up
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单项选择题
The person who ______ this type of research deserves our praise.
A．originated
B．manufactured
C．generated
D．estimated
单项选择题
He believe that the greatest of his ______ was that he'd never had a college education.
A．grieves
B．misfortunes
C．disasters
D．sorrows
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