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er several times before that. A. had been。 have met B. have been。 have met C. had been。 had met D. have been。 had met 3. The policemen ____ for the missing child for whole day and ____ him yet. A. have looked。 didn’t find B. have been looking。 haven’t found C. looked。 haven’t found D. have looked。 haven’t found 4. I _____ grammar for ten years, but I still can’t speak English. A. had studied B. studied C. an studying D. have been studying