【单项选择题】
Elementary and secondary education is（）
A、A.free
B、B.compulsory
C、C.free and attendance is required by law
D、D.Both B and C
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搜题
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第2题
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第3题
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第4题
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第5题
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第6题
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第7题
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第8题
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第9题
A、（（（p→q）∧（r→s））∧（p∨r））→（q∨s） B、（（（p→q）∧（r→s））∧（∨） C、（（p→q）∧（p→r））∧（∨））→p D、（（（p→q）∧（r→q））∧（p∨r））→q
