单项选择题

A．consists of
B．belongs to
C．houses
D．composes
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单项选择题
A．producedB．developedC．carried outD．experimented
A．produced
B．developed
C．carried out
D．experimented
单项选择题
A．at a timeB．sometimeC．sometimeD．sometimes
A．at a time
B．sometime
C．sometime
D．sometimes
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