When ____ help, one says "Thank you" while when _____ help, one asks "Can I help you?"
| A．ffered; offered | B．ffering; offered | C．offering; offering | D．offered; offering |
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When ____ help, one says "Thank you" while when _____ help, one asks "Can I help you?"
| A．ffered; offered | B．ffering; offered | C．offering; offering | D．offered; offering |
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