题文
__________ is certain is __________ prevention is more important than treatment.
| A．It; that |
| B．What; that |
| C．As; what |
| D．What; what |
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__________ is certain is __________ prevention is more important than treatment.
| A．It; that |
| B．What; that |
| C．As; what |
| D．What; what |
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