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    21、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

    21、B

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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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