单项选择题

A．erect
B．to erect
C．erecting
D．erects
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单项选择题
A．assembledB．constructedC．builtD．manufactured
A．assembled
B．constructed
C．built
D．manufactured
单项选择题
A．joinedB．linkedC．connectedD．added
A．joined
B．linked
C．connected
D．added
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