题文
As soon as they knew that someone needed help, the rescue team ________ at once.
| A．set off |
| B．set down |
| C．set aside |
| D．set about |
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As soon as they knew that someone needed help, the rescue team ________ at once.
| A．set off |
| B．set down |
| C．set aside |
| D．set about |
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