单项选择题

They all study hard but she studies the hardest __________.

A．all
B．of all
C．in all
D．all in all
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单项选择题
He __________ his homework when his mother came back yesterday evening.
A．was doing
B．is doing
C．did
D．does
单项选择题
enough time to study, I would have been able to enter university.
A．Have I
B．I have
C．Had I
D．I had
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