It is ____ great pity that the discovery of flight MH 370 still proves to be ____ failure.
| A．不填；a | B．the; the | C．a; a | D．a；不填 |
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It is ____ great pity that the discovery of flight MH 370 still proves to be ____ failure.
| A．不填；a | B．the; the | C．a; a | D．a；不填 |
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