题文
Every day he passes the hill beside the road, he always sees many workers ________ there.
| A．worked |
| B．to work |
| C．working |
| D．to be working |
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Every day he passes the hill beside the road, he always sees many workers ________ there.
| A．worked |
| B．to work |
| C．working |
| D．to be working |
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