--- How about the price of these washing machines?
--- They are at least equal in price to, if not cheaper than, at other stores .
A. others
B. ones
C. that
D. those
网友回答
A. others
B. ones
C. that
(答案→)D. those
解析：if not cheaper than为插入语，相当于if they are not cheaper than those at other stores。