单项选择题

No one really knows who composed this piece of music, but it has been ______ to Bach.

A．referred
B．attributed
C．identified
D．associated
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单项选择题
Reading became difficult for the old man, so the optician ______ glasses.
A．prescribed
B．subscribed
C．inscribed
D．described
单项选择题
After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.
A．abortive
B．difficult
C．experimental
D．excellent
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