Question

_______is worth doing at all is worth doing well.

1. A.
   Whatever
2. B.
   Whoever
3. C.
   However it
4. D.
   Whatever it

Answer 1

A
Whatever在此句中为复合关系代词, 本身具有"先行词+关系代词"的功能,
相当于anything that。因此后面不可再用it。