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
That's really like _____.
A．what war is
B．what is war
C．which is war
D．which war is
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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