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It was ____ the old worker came that we ____ the  experiment.

    A. until; didn’t begin              B. not until; began

    C. until; began                     D. not until; didn’t begin

It was ____ the old worker came that we ____ the  experiment.

       A. until; didn’t begin      B. not until; began

       C. until; began        D. not until; didn’t begin

It was____the old worker came that we____the experiment.

A.until;didn’t begin      B.not until;began

C.until;began         D.not until;didn’tbegin

It was ____ the old worker came that we ____ the experiment.

A. until; didn’t begin 　　　　　　 B. not until; began

C. until; began　　　　 　　　　 D. not until; didn’t begin

It was____the old worker came that we____the experiment.

        A.until;didn’t begin      B.not until;began

        C.until;began         D.not until;didn’tbegin