We've been through all this before.
A.We've experienced all this before. B.We've discussed these things before. C.We've thought over about these things before. D.We've forgotten all these things happened before.正确答案B
We've been through all this before.
A.We've experienced all this before. B.We've discussed these things before. C.We've thought over about these things before. D.We've forgotten all these things happened before.正确答案B