三道高中英语单选题,想要详解
6.Thebookwaswrittenin1946.___theeducationsystemhaswitnessedgreatchanges
A.WhenB.duringwhichC.sincethenD.sincewhen
7.-DoyouknowAnna'stelephonenumber.
-____.Asamatteroffact.Idon'tknowanyAnna,either.
A.IthinksoB.I'mafraidofC.IhopesoD.I'drathernot
8.Wehaven'tsettledthequestionof___itisnecessaryforhimtostudyabroud.
A.ifB.whereC.wheterD.that