问题描述：
---Excuse me,but I don’t think you can take photos here.
---Sorry I ____ this is no-photo zone.
A.don’t know B.didn’t know C.have no idea D.haven’t known
解释一下其它的3个选项为什么不对?
---Sorry I ____ this is no-photo zone.
A.don’t know B.didn’t know C.have no idea D.haven’t known
解释一下其它的3个选项为什么不对?
问题解答：
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