高中英语单选题讲解!【3】
Hedidthedemandingexperiment______ittookme.
Aone-thirdatimeBone-thirdtimeCtheone-thirdtimeDone-thirdthetime
标答D
[这句话是啥意思没懂啊...还有关于这个“几分之几”结构的详解一下...]