题文
(2012年河南长葛高三月考，29)He made another wonderful discovery，________of great importance to science.
| A．which I think is |
| B．which I think it is |
| C．which I think |
| D．I think which is |
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(2012年河南长葛高三月考，29)He made another wonderful discovery，________of great importance to science.
| A．which I think is |
| B．which I think it is |
| C．which I think |
| D．I think which is |
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