选哪个,请给出 原因,A.when B.which C.if D.that

选哪个,请给出原因.A.where B.that C.when D.which 选哪个,请给出原因.A.while B.in which C.except that D.in that 选哪个,请给出原因.A.It B.What C.That D.Which 选哪个,请给出原因.A.while B.whether C.what D.which 选哪个,请给出原因.A.when taking B.when taken C.when to taken D.when 选哪个,请给出原因.A.involving,that B.involved,that C.invovled,where 选哪个,请给出原因.A.used B.has been used C.using D.is using 选哪个,请给出原因.A.to realize B.realized C.have realized D.realizin 选哪个,请给出原因.A.proving B.proved C.was proved D.has been proved 选哪个,请给出原因.A.to travel B.travelled C.travel D.travelling 选哪个,请给出原因.A.speak B.speaking C.spoken D.to speak 选哪个,请给出原因.A.Planting B.Planted C.To plant D.To be planted