I ____ him ____ he left school.

A. have recognized; since
B. have known; since
C. had recognized; before
D. had known; after
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科目：高中英語 來源：山西省模擬題 題型：單選題

I ____ him ____ he left school.
[     ]
A. have recognized; since
B. have known; since
C. had recognized; before
D. had known; after

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