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The past perfect progressive of investigate is had been investigating.

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10y ago
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1w ago

The past perfect progressive tense of "to investigate" is "had been investigating."

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Q: What is the past perfect progressive tense of to investigate?
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present tense past tense future tense present perfect tense past perfect tense future perfect tense present progressive tense past progressive tense future progressive tense present perfect progressive tense past perfect progressive tense future perfect progressive tense


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