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Completing all the homework by the dinner, John felt very tired. He __________all day long.
A. was studying B. studies C. has studied D. had been studying
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Completing all the homework by the dinner, John felt very tired. He __________all day long.
A. was studying B. studies C. has studied D. had been studying
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Completing all the homework by the dinner, John felt very tired. He __________all day long.
| A．was studying | B．studies | C．has studied | D．had been studying |