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
It is urgent that a new president __________ for the university.
A．is elected
B．elected
C．will be elected
D．be elected
单项选择题
Every knife and fork __________ carefully.
A．have cleaned
B．has cleaned
C．have been cleaned
D．has been cleaned
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