题文
When ___ help, one often says”Thank you” or”It is very kind of you”.
| A．offering |
| B．to offer |
| C．to be offered |
| D．offered |
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When ___ help, one often says”Thank you” or”It is very kind of you”.
| A．offering |
| B．to offer |
| C．to be offered |
| D．offered |
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