It was in the lab ______ was taken charge of by Professor Harris _______ they did the experiment.
| A．which, that | B．that, where |
| C．where, that | D．which, where |
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It was in the lab ______ was taken charge of by Professor Harris _______ they did the experiment.
| A．which, that | B．that, where |
| C．where, that | D．which, where |
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