题文
The situation is getting worse. We must ________ the trouble __________.
| A．keep; spreading | B．prevent; spreading |
| C．stop; to spread | D．protect; to spread |
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The situation is getting worse. We must ________ the trouble __________.
| A．keep; spreading | B．prevent; spreading |
| C．stop; to spread | D．protect; to spread |
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