1.
(2023·浙江模拟)
将十进制正整数转化为二进制数,对应的Python 程序如下:
def toStr(n,base):
s = "01"
if n < base:
return s[n]
else:
return ①
n = int(input('请输入正整数:'))
result = toStr(n,2)
print(result)
则代码中①处的语句可为( )
A . toStr(n // base, base) + s[n % base]
B . s[n % base] + toStr(n // base, base)
C . toStr(n % base, base) + s[n // base]
D . s[n // base] + toStr(n % base, base)