单项选择题

All his teachers （） his success to his diligence and perseverance.

A．owe
B．refer
C．subject
D．attribute

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单项选择题
（） that is found is valuable.

A．It is not every pearl
B．When not every pearl
C．Not every pearl
D．Every pearl that is not
单项选择题
No one really knows who composed this piece of music, but it has been（） to Bach.

A．referred
B．associated
C．identified
D．attributed
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