________, it began to rain unexpectedly.
| A．While cleaning the machine |
| B．To clean the machine |
| C．He was cleaning the machine |
| D．While he was cleaning the machine |
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________, it began to rain unexpectedly.
| A．While cleaning the machine |
| B．To clean the machine |
| C．He was cleaning the machine |
| D．While he was cleaning the machine |
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