I think it is the coldest winter that I ___these days.A.knew B.have known 要解析
问题描述：
I think it is the coldest winter that I ___these days.A.knew B.have known 要解析
答
选择B
可根据these days看出不能用过去式
其次复合句前半句是现在时态 要保持时态一致后面不能用过去式