Although the increase in the present sum used for the research is________， a great breakthrough could still be achieved by the end of this year.
| A．common | B．sudden |
| C．enormous | D．modest |
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Although the increase in the present sum used for the research is________， a great breakthrough could still be achieved by the end of this year.
| A．common | B．sudden |
| C．enormous | D．modest |
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