it is a or b which is unimportant already.already用的对不?

it is a or b which is unimportant already.already用的对不? ——which car is better,the red one or the black one?——i prefer the red one,but it is really a——which car is better,the red one or the black one?——i prefer the red one,but it is really a matter a personal ____.A.taste B.style C.affair D believe it or not,I'm sure that is ____ people call the six sense.A.what B.which C.why D.whenbelieve it or not,I'm sure that is ____ people call the six sense.A.what B.which C.why D.when为什么不选B It is ______,I think you left it.A.where B.in which He made another wonderful discovery ,____ of great importance to science.（a）A.which I think is B.which I think it is C.which I think it D.I think which is Which picture is ,this one or that one?I like the one with a cat on it. He made another wonderful discovery,___of great importance to science.A:which I think is B:which I think it is C:which I think it D:I think which is 选什么, He has done a lot of work,___ necessary to our study.A.which I think is B.which I think it is C.I think which is D.which I think is itWhich one?why? A or B,which is better还是A and B,which is better? 求正确答案:He made another wonderful discovery,____of great impoortance to science.A:which ithink is; B:which I think it is; C:which I think it; D:I think which is; I have a wallet.It is small__nice.A.and B.or C.but I have a wallet.It is small__nice.A.and B.or C.but Air,or ____ is called the atmosphere,surrounds the whole world.A.it B.which C.what D.that -which is more useful,biology or chemistry -i think ___them is useful.-which is more useful,biology or chemistry -i think ___them is useful.a.either of b .none of c,both of d.all of 选哪个 ,回答,急 Is this the river _____ I can swim?A.which B.in which C.that D.it He made another wonderful discovery( ) of great important to science.A.which I think is B.which I think it is C.which I think it D.I think is 题干He put forward a theory,_______ of great importance to the progress of science and technology.选择一项：a.I think which is b.which I think is c.I think it is d.which is I think It is the country ()I studied English ()I am going to visit next week.A.In which;which B.Where;that C.that;that D.which ;that