The socio-economic benefits of education are many; most nations require mandator

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问题 The socio-economic benefits of education are many; most nations require mandatory schooling.

选项 A、documentary
B、commentary
C、factory
D、obligatory

答案 D

解析词义辨析mandatory命令的，强制的；A．documentary文件的；B．commentary注释，解说词；C．factory工厂，制造厂；D．obligatory义不容辞的，必须的；因此D为答案。

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