There are many beautiful flowers on ________ side of the road.A.eachB.everyC.allD.both
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A解析both用于两者。如：on both sides of the street (road, river)；each和either也可用于两者，但后接单数名词。如：on either (each) side of the street (road, river)；every后接单数名词指三者或三者以上中的每一个；all接复数名词指多数中的每一个。如：on all sides of the lake。