单项选择题

A．requested
B．used
C．required
D．took
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单项选择题
A．ofB．throughoutC．amongD．through
A．of
B．throughout
C．among
D．through
单项选择题
A．inventingB．inventedC．to inventD．being invented
A．inventing
B．invented
C．to invent
D．being invented
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