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We don't know his telephone number; if we , we him now. [ ]A. know; must telepho

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We don't know his telephone number; if we , we him now. [ ]A. know; must telepho

We don't know his telephone number; if we ____, we _____   him now. [     ]A. know; must telephone
B. knew; would telephone
C. have known; have telephoned
D. knew; have telephoned

试题答案

B