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I didn’t know his telephone number. ________ it, I ________ then. A. Had I known; would ring him up ...
题目内容：
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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