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    17、China’s population is expected to increase to about 1.5 billion in 2040，____ it will start to decline slowly．

    A．where            B．which           C．on which            D．after which

    17、D

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    China’s population is expected to increase to about 1.5 billion in 2040，____ it will start to decline slowly．

    A．where            B．which           C．on which            D．after which

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