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Jack had traveled six miles across the Channel  _____his engine failed and was forced to land on the sea .     

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

Jack had traveled six miles across the Channel  _____his engine failed and was forced to land on the sea .

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

 Jack had traveled six miles across the Channel  _____his engine failed and was forced to land on the sea .     

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

Jack had traveled six miles across the Channel___________his engine failed and was forced to land on the sea .

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

Jack had traveled six miles across the Channel___________his engine failed and was forced to land on the sea .

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