有如下Python程序段，执行程序后，输出的结果是？（ ）
import csv
with open('123.csv', 'w',newline='') as f:
w=csv.writer(f)
w.writerows([('hello','world'), ('I','love','you')])
with open('123.csv', 'r') as f:
sp= csv.reader(f)
for row in sp:
print(row[0],end=',')
hello,I,
hello,world
I,you