I had been helping my neighbor for a year before ...

[ Tenses ]

I had been helping my neighbor for a year before he finally thanked me.

A. Past Simple

B. Past Continuous

C. Past Perfect Continuous

D. Past Perfect

Select your answer:

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Connectives Adverbial Clauses Articles A and An Noun and Pronoun Verb Forms and Prepositions Clause Markers TOEFL Grammar Present Simple/Affirmative Auxiliary Verbs Verb + Infinitive or Gerund

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