have all the girls in our class known that they will have a five-day visit to jiuzhai valley?

have all the girls in our class known that they will have a five-day visit to jiuzhai valley?

题目
have all the girls in our class known that they will have a five-day visit to jiuzhai valley?
yes,every girl_about it but that's unbelievable.A.were told B.has told C.has been told
应该选A.B.C哪个
答案
我们班的所有女生都知道他们将去九寨沟5日游吗
c
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