Question

Only when ____ left, did we notice what she had done. *
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Answer 1

Answer:

only when she left , did we notice what she had done .

hope it helps you

Answer 2

Only when she left, did we notice what she had done.

• The word "she" should be placed in the blank of the sentence.
• The word "she" is a feminine associated pronoun. It fits the context of the sentence becuase the later part of the sentence mentions the word "she" already, suggesting that a person of female gender is the subject of the sentence.
• The pronoun "she" is used instead of all the other feminine pronouns because it is used when a sentence is spoken/written in 3rd person narrative.
• We also know from the later part of the sentence that, only a single person is being talked about hence the pronoun "they" referring to plural subjects is not applicable.