单项选择题


A．have
B．has
C．had
D．have had
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单项选择题
A．groupedB．classifiedC．composedD．knew
A．grouped
B．classified
C．composed
D．knew
单项选择题
Sony created a consumer-robot market by ______.
A．lowering prices
B．marketing a robot dog
C．attending RoboCup
D．virtue of its reputation
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