问题
选择题
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
答案
答案：D
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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
答案：D