单项选择题

Mary is the top student in the class. She studies harder ______.

A．than any student
B．than all the students
C．than any other student
D．than some other student
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单项选择题
Thousands of people in the city ______ to welcome the visiting guests.
A．turned off
B．truned up
C．truned out
D．turned over
单项选择题
The treaty was made to protect the country ______ invasion by its neighbours.
A．of
B．for
C．with
D．from
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