题文
His opening up _____ food processing factory is _____ comfort to his parents．
| A．不填；a | B．a；不填 |
| C．a；a | D．the；不填 |
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His opening up _____ food processing factory is _____ comfort to his parents．
| A．不填；a | B．a；不填 |
| C．a；a | D．the；不填 |
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