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 |
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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 |
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