The crime rate in this country______from 7% to 4% in the past two years.A.has fallenB.had

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The crime rate in this country______from 7% to 4% in the past two years.

A.has fallen

B.had fallen

C.is falling

D.was falling

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_________。