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    12、AIDS is said ______ the biggest health threat to both men and women in that area over the past few years．

    A．being         B．to be          C．to have been          D．to being

    12、C

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    AIDS is said ______ the biggest health threat to both men and women in that area over the past few years．

    A．being         B．to be          C．to have been          D．to being

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