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    19．Ships may have to wait for a couple of days. waves are not rough.permitting them to enter the harbor with safety． A．after B．while C．when D．since 20 80 tons.the B一19 was clearly the largest and most advanced warplane in the world． A．Weighed B．Being weighed C．To weigh D．Weighing 【查看更多】

     

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    Ships may have to wait for a couple of days，      waves are not rough，permitting them to enter the harbor with safety．

        A．after           B．while            C．when            D．since

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