1.isthisflat____youoncelivedin?
2./isthistheonlyflat___youoncelivedin?
3/isthistheflat___youoncelived?
4/isthistheflatin___youoncelived?
5/isitinthisflat____youoncelived?
A.whichB.whereC.theoneD.that
再说下为什么要那样选.我看都差不多的啊,要怎么来区分啊?我只知道theonly选that其它的.
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