题目
Jack and Susan ________ each other since they were children,so nobody was surprised to hear that they were married.
A.knew B.have known C.had known D.were known
A.knew B.have known C.had known D.were known
提问时间：2020-10-13
答案
C
since 一般和现在完成时连用,由于下文 so nobody was surprised to hear that they were married.是一般过去时,可见是相对这一过去时点来说的,过去的过去,用过去完成时
since 一般和现在完成时连用,由于下文 so nobody was surprised to hear that they were married.是一般过去时,可见是相对这一过去时点来说的,过去的过去,用过去完成时
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