AACB但是我不是很懂为什么,1.-----Yourjob__openforyourreturn.-----Thanks.A.willbekeptB.willkeepC.hadkeptD.hadbeenkept2.ItissaidthattheearlyEuropeanplaying-cards___forentertainmentandeducation.A.werebeingdesigne

　　AACB但是我不是很懂为什么,

　　1.-----Yourjob__openforyourreturn.

　　-----Thanks.

　　A.willbekeptB.willkeep

　　C.hadkeptD.hadbeenkept

　　2.ItissaidthattheearlyEuropean

　　playing-cards___forentertainment

　　andeducation.

　　A.werebeingdesignedB.havedesigned

　　C.havebeendesignedD.weredesigned

　　为什么这个不选D？

　　3.Theconstructionofthetwonew

　　railwaylines_______bynow.

　　A.hadcompleted

　　B.havecompleted

　　C.havebeencompleted

　　D.hasbeencompleted

　　为什么这个不选D？

　　4.—DoyouhaveanyideawhatPauldoes

　　allday?

　　—AsIknow,hespendsatleastasmuch

　　timeplayingashe________.(重庆2007)

　　A.writesB.doeswriting

　　C.iswritingD.doeswrite

　　这道题真是一点也不懂....