The Chinese mainland has 157 billionaires as of 2013，_________second in the number of billionaires worldwide．
| A．having ranked | B．ranked | C．to rank | D．ranking |
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The Chinese mainland has 157 billionaires as of 2013，_________second in the number of billionaires worldwide．
| A．having ranked | B．ranked | C．to rank | D．ranking |
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