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What is the present perfect progressive tense of the verb (to investigate.) Detectives _____ for months. were investigating have investigated investigate have been investigating
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What is the present perfect progressive tense of the verb (to investigate.)

Detectives _____ for months.

were investigating

have investigated

investigate

have been investigating

User Lak
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2 votes

have been investigating

User Nerdoc
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3 votes
have been investigating
User Belder
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7.9k points
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