The law that farmers don’t need to turn over agricultural tax to the state has come into .

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(答案→)A. effect
B. season
C. view
D. power
解析：词义辨析。  A.影响；效果 B.时期；季节 C. 观察；视野      D. 功率；能力；势力。句意：农民不必向国家缴纳农业税的法律已经生效。短语Come into effect开始生效，开始实施，故选A。