I don't know which dress (wear)

I don't know which dress (wear) I don't know which sportswoman I should support同义句:I don't know( )( )( )( ). I don't know ___to deal with such matter?A:what B:how C:which D/ I don't know _____to send e-mail.A.how B.what C.which D.who I don't know ___film to see.( ) A which B what C whose D why Don't know what i'd do There were times ( ) I don’t know what to sayA which B when C of which D of whom I don't know which sportswoman I should suI don't know which sportswoman I should suport.=I don't know ( ) ( ) ( ) ( ). I don't know which sweater _____(choose) I don,t know which one _____ （choose) i don't know choose which one为什么不对?谢谢 I really don't know which one to choose I don't know which watch _____(choose). I don't know which bus____(go) to station? 1,I don't know ( )these cars is the best.A.which1,I don't know ( )these cars is the best.A.which B.which on C.which of D.which one of.答案为C请问为什么 英语：I don'T know which one_____(choose)I don'T know which one_____(choose)再帮忙说一下为什么. 是I don't know which one is your father还是I don't know which one your father is There are four answer here.I really don't know ( ) .A.which to choose B.choose which one C.to choose which one D.which one choose