The Yellow River flood large areas, but now the waters of it are used to energy.
| A．was used to; producing | B．used to; producing |
| C．was used to; produce | D．used to; produce |
The Yellow River flood large areas, but now the waters of it are used to energy.
| A．was used to; producing | B．used to; producing |
| C．was used to; produce | D．used to; produce |
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