[ Past Perfect Simple & Past Perfect Continuous ]
We use had been + the -ing of the main verb to form the past perfect continuous.
A. TRUE
B. FALSE

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Perfect Verb TensesSubordination ConjunctionsCompound SentencesTransitional Phrases and Conjunctionslike/do not likeVerb TensesAdverb of MannerGrammar and Sentence StructureInversions and SubjunctiveAbilityOther quiz:
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A. are getting used to
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He _____ on jets and airplanes.
A. work
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I didn’t tell you the truth _____ I didn’t want to hurt your feelings.
A. so
B. because