We can say __________ that their work is on the path of sound development.
| A．on good evidence |
| B．on good proof |
| C．on a good evidence |
| D．on a good proof of |
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We can say __________ that their work is on the path of sound development.
| A．on good evidence |
| B．on good proof |
| C．on a good evidence |
| D．on a good proof of |
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