A．Before 2000, only candidates from the two major parties took part in the debates.
B．.The CPD has already become a tripartisan organization now.
C．The policy of the CPD has been changing since its establishment.
D．Third party candidates are required to take part in a number of opinion polls.
参考答案A
解析:
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A．economic development.
B．slavery,
C．honesty.
D．bi-party system.
