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
At the international conference, the famous scientist gave an excellent report ______ on his recent experiment.
A．basing
B．based
C．to be based
D．to base
单项选择题
Once _______ water, fish can't live.
A．depriving of
B．depriving
C．deprived of
D．deprived
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