Having keen sense of smell, tracker dogs were great help in searching for survivors i——青夏教育精英家教网—

摘要： Having keen sense of smell, tracker dogs were great help in searching for survivors in Wenchuan earthquake. A. the-a B. a-a C. the-the D. a-the

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Having ______ keen sense of smell, tracker dogs (警犬) were ______ great help in searching for survivors in Wenchuan earthquake.

A. the…a B. a…a C. the…the D. a…the

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