单项选择题
A．granted
B．granting
C．inventing
D．invented
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单项选择题
A．extendingB．will extendC．extendedD．to be extended
A．extending
B．will extend
C．extended
D．to be extended
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单项选择题
A．customerB．commerceC．patentD．television
A．customer
B．commerce
C．patent
D．television
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