—The house was torn down.—Really?I ____ it.A.don't know B.haven't known C.didn't know D.hadn't known

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—The house was torn down.—Really?I ____ it.A.don't know B.haven't known C.didn't know D.hadn't known

—The house was torn down.—Really?I ____ it.A.don't know B.haven't known C.didn't know D.hadn't known
—The house was torn down.—Really?I ____ it.A.don't know B.haven't known C.didn't know D.hadn't known

—The house was torn down.—Really?I ____ it.A.don't know B.haven't known C.didn't know D.hadn't known
C.你说话的时候已经知道了,所以不知道的状态已经过去.