题文
It’s just pipes, water and pumps, but we haven’t heard of anyone else ________ this technology in this way before.
| A．to use | B．using | C．use | D．used |
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It’s just pipes, water and pumps, but we haven’t heard of anyone else ________ this technology in this way before.
| A．to use | B．using | C．use | D．used |
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