When they start investigating, several irregularities were detected.

Started investigate

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Started an investigation

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Start investigation

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Started off investigation

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Solution

The correct option is B Started an investigation
The sentence is past tense. So, 'started' is correct and 'Investigation' is the word that should be used in the expression.
Eg: The police started an investigation into the triple homicide case.

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Similar questions

Spot the main verb in the sentence.

A detective will be investigating the case.

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