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

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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.obfigatory义不容辞的,必须的;因此D为答案。
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