单项选择题

A．developing
B．developed
C．being developed
D．having developed
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单项选择题
A．At five.B．At six.C．At eight.D．At twelve.
A．At five.
B．At six.
C．At eight.
D．At twelve.
单项选择题
A．holdsB．heldC．holdingD．having held
A．holds
B．held
C．holding
D．having held
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