He switched off the light and was about to leave the classroom and only then ________ to rain heavily.
| A．did it begin | B．it began |
| C．does it begin | D．it begins |
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He switched off the light and was about to leave the classroom and only then ________ to rain heavily.
| A．did it begin | B．it began |
| C．does it begin | D．it begins |
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