1007.Could you do me a favor?
—It depends on ____ it is.
A.which
B.whichever
C.what
D.whatever
1008.What we used to think _____ impossible now does seem possible.
A.is
B.was
C.has been
D.will be
1007.答案是C;疑问词+ever引导让步状语从句或名词性从句，根据句意，此处应表示:要看帮的是什么忙，故选what。
1007.答案是B;根据此题中we used to think插人语的时态暗示，此空应用过去时。
