摘要： I didn’t know his telephone number. it, I then. A. Had I known, would ring him up B. Should I know, would have rung him up C. If I knew; would ring him up D. Had I known; would have rung him up
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I didn't know his telephone number．________ it, I ________ then．
- A.If I had known; would have rung him up
- B.Should I know; would have rung him up
- C.If I knew; would ring him up
- D.Had I known; would ring him up