题文
We know that 80 of the cases of blindness can .
| A．per cents; cure | B．percent; cured | C．per cent; be cured | D．percent; are cured |
We know that 80 of the cases of blindness can .
| A．per cents; cure | B．percent; cured | C．per cent; be cured | D．percent; are cured |
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