单项选择题

In the ______ of many parents, standards of education in the public school are actually falling.

A．idea
B．thought
C．opinion
D．principle
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单项选择题
______ entering his flat, Jack was shocked to find his new computer missing.
A．In
B．On
C．By
D．At
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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