单项选择题

A．inventing
B．invented
C．to invent
D．being invented
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单项选择题
A．to have comeB．comingC．comeD．to come
A．to have come
B．coming
C．come
D．to come
单项选择题
A．indoorB．indoorsC．outdoorsD．outdoor
A．indoor
B．indoors
C．outdoors
D．outdoor
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