Three years -- since they came to this schoolA .have past B.has passed C .has past D .have passed
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Threeyears--sincetheycametothisschoolA.havepastB.haspassedC.haspastD.havepassedThreeyears--sincethey
Three years -- since they came to this schoolA .have past B.has passed C .has past D .have passed
Three years -- since they came to this school
A .have past B.has passed C .has past D .have passed
Three years -- since they came to this schoolA .have past B.has passed C .has past D .have passed
B Three years 当作整体看待,pass的过去式是passed
选b 因为时间做主语用单数
选 D，因为三年是复数氢用have，后面要用动词过去式。
答案是D，pass的过去分词是passed。
b Three years 当作整体看待，用has，pass的过去式是passed
选 B ，three years 在这里作为一个整体来看待。英语中表示时间，距离，金钱，重量的名词作主语，看做整体，谓语常用单数。
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