They ____________ in the river when it __________ to rain.
| A．were swimming; began |
| B．swam; was beginning |
| C．swam; began |
| D．were swimming; was beginning |
They ____________ in the river when it __________ to rain.
| A．were swimming; began |
| B．swam; was beginning |
| C．swam; began |
| D．were swimming; was beginning |
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