The professor, ________ his assistants, _______ conducting the experiment.
| A．in addition, is | B．as well, is |
| C．in addition to, are | D．as well as, is |
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The professor, ________ his assistants, _______ conducting the experiment.
| A．in addition, is | B．as well, is |
| C．in addition to, are | D．as well as, is |
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