题目内容
（请给出正确答案）
from bs4 import BeautifulSoup doc=''' ＜title＞The Dormouse's story＜/title＞
The Dormouse's story
＜/book＞＜/book＞＜/book＞＜/book＞＜/book＞＜/bookstore＞＜/selector＞＜/selector＞＜/selector＞＜/selector＞＜/selector＞＜/selector＞＜/class＞＜/class＞＜/selector＞＜/selector＞＜/class＞＜/selector＞＜/selector＞＜/selector＞＜/selector＞＜/bookstore＞＜/body＞＜/html＞＜/title＞＜/generator＞＜/selector＞＜/selector＞＜/selector＞＜/selector＞＜/bookstore＞＜/body＞＜/html＞＜/title＞＜/book＞＜/bookstore＞＜/body＞＜/html＞
Once upon a time there were three little sisters; and their names were Elsie, Lacie and Tillie; and they lived at the bottom of a well.
...
''' soup=BeautifulSoup(doc,"lxml") ___________________________________ for tag in tags: print(tag) 查找文档中class="sister"的元素,缺失语句是：
A、tags=soup.find(name=None,attrs={"class":"sister"})
B、tags=soup.find(attrs={"class":"sister"})
C、tags=soup.find_all(attrs={"class":"sister"})
D、tags=soup.find_all(name=None,attrs={"class":"sister"})
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