73. The following SAS program is submitted:
data work.test;
First = 'Ipswich, England';
City_Country = substr(First,1,7)!!', '!!'England';
run;
Which one of the following is the length of the variable CITY_COUNTRY in the
output data set?
A. 6
B. 7
C. 17
D. 25
Answer: D

为何答案是D呢？在SAS里面run了一下 结果是Ipswich,England.这样的话长度也不是25
呀？谢谢