At present, we are studying a total of nine subjects, ________ I think is physics.
| A．of them the most difficult | B．and the most difficult of which |
| C．the most difficult of them | D．the most difficult of which |
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At present, we are studying a total of nine subjects, ________ I think is physics.
| A．of them the most difficult | B．and the most difficult of which |
| C．the most difficult of them | D．the most difficult of which |
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