Different means______to prevent the surplus population of China.

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问题 Different means______to prevent the surplus population of China.

选项 A、have tried
B、have been tried
C、has tried
D、has been tried

答案B

解析本题考查主谓一致与被动词态的用法。means用于抽象意义时意思是“方法，手段”，应该用做复数，做主语时应用被动语态。故正确的答案为B。

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