Experts have found that the disease will lead to a greater increase in the number of sufferers unless ________ seriously when the symptom first appears.
| A．treated | B．to be treated |
| C．being treated | D．be treated |
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Experts have found that the disease will lead to a greater increase in the number of sufferers unless ________ seriously when the symptom first appears.
| A．treated | B．to be treated |
| C．being treated | D．be treated |
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