He made another wonderful discovery, _____ of importance to science.
| A．which I think is |
| B．which I think it is |
| C．which I think it |
| D．I think is |
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He made another wonderful discovery, _____ of importance to science.
| A．which I think is |
| B．which I think it is |
| C．which I think it |
| D．I think is |
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