There were two boys in the lab, ______did the experiment successfully.
| A．the clever of whom |
| B．the cleverer or whom |
| C．the clever of them |
| D．the more clever of them |
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There were two boys in the lab, ______did the experiment successfully.
| A．the clever of whom |
| B．the cleverer or whom |
| C．the clever of them |
| D．the more clever of them |
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