题文
A new technique_________, the yields as a whole increased by 20 percent.
| A．working out |
| B．having worked out |
| C．having been worked out |
| D．to have been worked out |
A new technique_________, the yields as a whole increased by 20 percent.
| A．working out |
| B．having worked out |
| C．having been worked out |
| D．to have been worked out |
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