What is that which you have just stuffed into the plastic cup?此处which的用法?

whose/who/which/what child is that girl?选哪个 what you say is quite true.中的what等于that which.若换成that which ,that可省吗?为什么 This is the only thing ()I have nowA./ B.what C.which D.that which Is that( )he said A.all what B.all which C.all D.which what is it which makes a scientific achicevement important?为什么要把WHICH改成THAT? Which is that girl. ._______she won the English contest is ______we had expected .A That ,what B What ,that C That ,which D What ,which that is,what is 和which is的用法区别是什么 ( )child is that girl?A what B Who C Which D What Doyou know_?A.what country is thisB.what countrythisisC.whoso countryis thatD.which countryis that Is that the reason____you are here?A which B what C why D for that That is all _______ he has done.A.which B.that C.what D.why 7.The most important thing______we should pay attention to is the first thing_____I’ve said.A which;that B that;which C what;that D that;that Can you guess____the world _______first letter is given isA what whose B what which Cwhat is whose Cwhat is that Vector ,which is directed along an x axis,is to be added to vector ,which has a magnitude of 7.4 m.The sum is a third vector that is directed along the y axis,with a magnitude that is 4.3 times that of .What is the magnitude of 帮个忙~..如果解 Her money is not only thing__ is missing.A,which B,that C,what John is _ is known as a hacker- A.who B.what C.that D.which The problem is _______ he is too tired.A.which B.when C.what D.that