Having been ___ volunteer in a day-care centre for weeks, Susan feels much sympathy for ___ disabled.
| A．a; / | B．/; a | C．the; the | D．a; the |
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Having been ___ volunteer in a day-care centre for weeks, Susan feels much sympathy for ___ disabled.
| A．a; / | B．/; a | C．the; the | D．a; the |
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