The best way to the park is .A. by busB. ride a bikeC. take the busD. on bike

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(答案→)A. by bus
B. ride a bike
C. take the bus
D. on bike
解析：句意：去公园最好的方式是乘公交车。ride a bike/bikes骑单车，take the bus 乘公共汽车，都是需要做谓语的，题中已经有了谓语动词is,所以排除，by bus乘公共汽车，固定短语，故选A.