问题补充：
The house price is going up .
A. year and year
B. year after year
C. year to year
D. year by year
答案：
A. year and year
B. year after year
C. year to year
(答案→)D. year by year
解析：year and year无此说法;year after year年复一年的;year to year 无此说法;year by year逐年,年年.句意:房价是逐年增长.结合语境可知选D.
