1. When they started an investigation it was revealed that a fraud had been perpetrated.
2. When they started investigating it was revealed that a fraud had been perpetrated.
3. When they started to investigate it was irealed that a fraud had been perpetrated.
Could please explain which of the above sentence is grammatically correct ?.
KANA RAM MEENA 1. When they started an investigation , it was revealed that a fraud had been perpetrated. 2.
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KANA RAM MEENA1. When they started an investigation, it was revealed that a fraud had been perpetrated.
2. When they started investigating, it was revealed that a fraud had been perpetrated.
3. When they started to investigate, it