. --Can you smell something _________ in the house?
--Oh! I forgot to turn off the gas cooker!
| A．to burn | B．burning | C．having burnt | D．having been burnt |
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. --Can you smell something _________ in the house?
--Oh! I forgot to turn off the gas cooker!
| A．to burn | B．burning | C．having burnt | D．having been burnt |
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