字典d＝{'abe':123,'def':456,'ghi':789},len(d)的结果是:()

字典d＝{'abe':123,'def':456,'ghi':789},len(d)的结果是:()
A.3
B.6
C.9
D.12
正确答案：3

字典d＝{&#39;abe&#39;:123,&#39;def&#39;:456,&#39;ghi&#39;:789},len(d)的结果是:()