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The volunteers are doing _____ difficult and important work; they share _____ common goal — to help people in need.
| A．a; a | B．a; the | C．不填; the | D．不填; a |
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The volunteers are doing _____ difficult and important work; they share _____ common goal — to help people in need.
| A．a; a | B．a; the | C．不填; the | D．不填; a |
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