U. S. senators serve for______years after they are elected.A.fourB.sixC.threeD.two

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U. S. senators serve for______years after they are elected.

A.four

B.six

C.three

D.two

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。