We have made _______great progress in the medical field, but ______ progress we have made is not enough.
| A．a; a | B．a; the | C．/; the | D．/; / |
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We have made _______great progress in the medical field, but ______ progress we have made is not enough.
| A．a; a | B．a; the | C．/; the | D．/; / |
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