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
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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
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
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