Question

--- How about the price of these washing machines? 

--- They are at least equal in price to, if not cheaper than, _____ at other stores .

1. A.
   others
2. B.
   ones
3. C.
   that
4. D.
   those

Answer 1

D
if not cheaper than為插入語，相當(dāng)于if they are not cheaper than those at other stores。