–Why don’t you stay at the Baotuquan Hotel? 

--You      ! Do you know how expensive that place is?       

–Why don’t you stay at the Baotuquan Hotel? 
--You      ! Do you know how expensive that place is?

1. A.
   must be joking
2. B.
   can’t be joking
3. C.
   must joke
4. D.
   can joke

------Why don’t you stay at the Baotuquan Hotel?

------You _______ ! Do you know how expensive that place is ?

A. must be joking   B. can’t be joking   C. must joke   D. can joke

–Why don’t you stay at the Baotuquan Hotel? 
--You      ! Do you know how expensive that place is?