【上海市2015年中考英语试题】Martin was so busy ______ the old that he gave up his part-time job.
| A．helping | B．helped | C．to help | D．help |
【上海市2015年中考英语试题】Martin was so busy ______ the old that he gave up his part-time job.
| A．helping | B．helped | C．to help | D．help |
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