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    31．We wonder how seamen explored the oceans before latitude and longitude made it possible to plot a ship’s position on a map. A．need B．must C．may well D．should 【查看更多】

     

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    We       wonder how seamen explored the oceans before latitude and longitude made it possible to plot a ship’s position on a map.

    A．need         B．must         C．may well          D．should

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