单项选择题

The designer has applied for a ______ for his new invention.

A. tariff
B. discount
C. version
D. patent
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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
You could become a good musician, but your lack of practice is ______ you ______.
A. taking; up
B. holding; back
C. making; up
D. leaving; out
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