[ Adverb Clauses ]
By the time Alfonso 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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After the show, every audience stood up to congratulate him ______ his wonderful performance.
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A. easier
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We should __________ more fruits and vegetables.
A. has
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C. have
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