By the time Robert finally graduated from high school, he ................. seven different schools because his parents moved frequently. A. attended B. was attending C. had attended D. had been attending - Tenses | English Grammar Quiz

By the time Robert finally graduated from high school, he …………….. seven different schools because his parents moved frequently.

A. attended

B. was attending

C. had attended

D. had been attending

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Past Participle Simple Present Tense Adverb

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