单项选择题

You must study, ( ), or even harder than your sister.

A、so hard than
B、so hard as
C、as hard than
D、as hard as
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单项选择题
New cities appeared on ( ) sides of the river.
A、every
B、each
C、both
D、all
单项选择题
Playing ( ) is the most important principle in a competition, and all competitors should be treated ( ).
A、fairly/ fairly
B、fairly/ fair
C、fair/ fairly
D、fair/ fair
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