[ 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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Present Perfect Tense › ViewThey are singing and dancing because their uncle……
A. has arrived
B. is arriving
C. arrives
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The scientific history of radium ______ beautiful.
A. was
B. is
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A. easier
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We should __________ more fruits and vegetables.
A. has
B. had
C. have
D. having
