The Diaoyu islands have been part of China's territory since ancient times, ________ as important fishing grounds of Taiwan.
| A．served | B．to serve |
| C．serving | D．having served |
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The Diaoyu islands have been part of China's territory since ancient times, ________ as important fishing grounds of Taiwan.
| A．served | B．to serve |
| C．serving | D．having served |
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