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
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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
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
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