The correct structure is 'on which' or the relative adverb 'when' to refer to a date or event.
La estructura correcta es 'on which' o el adverbio relativo 'when' para referirse a una fecha o evento.
| Task | Danny still remembers the day ______ he first flew an aircraft. |
|---|---|
| Answer | 4 |
| a | on when |
| b | that |
| c | which |
| d | on which |
| comment | It is correct to say 'on which'. This structure is quite formal, so we could use here a relative adverb 'when'. |
| topic | adverbs |
| level | 2 |
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