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单项选择题


A．method
B．way
C．rule
D．idea
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单项选择题A．beingB．to beC．beenD．were

A．being
B．to be
C．been
D．were

单项选择题A．inventingB．inventedC．to inventD．being invented

A．inventing
B．invented
C．to invent
D．being invented