____ we can't get seems better than _____ we have.

A. What; what B. What; thatC. That; that D. That;

what
答案是a,但b为什么不行?请教我如何区分....

we must do all ____ we can do ____ him 英语请教：the box is _____ smalls; we can't put ____ food in it. I can never forget the day ____ we worked together and the day ____ we spent together. Can't you hear ____? I just can't understand ____ We can not figure out ____ quite a number of insects,birds are dying out ____ from the top of the TVtower, and we can get ... No evidence has ben gathered ____ food genes can enter human cells from the food we eat. ____ we call a computer is really a kind of tool that can do work for man This is the woman ____ can be seen in the Mona Lisa. A.that B.we C.who D.you